Documents published in 2021 : Scipedia

On Correlations Between Local Microstructure and The Appearance of Fibre Breaks in Unidirectional Composite Materials
C. Breite, S. Lomov, Y. Swolfs

Presentations to VIII Conference on Mechanical Response of Composites.
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Calibration and Validation of a Numerical Curing Model Using AS4/8552 Asymmetrical Laminated Composite Plates
T. Koenis, N. van Hoorn, W. van den Brink

Presentations to VIII Conference on Mechanical Response of Composites.
- 10
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Micromechanical Interaction Model Accounting for the Spatial Distribution of Inclusions in Elastic-Viscoplastic Composites
K. Kowalczyk-Gajewska, M. Majewski, S. Mercier, A. Molinari

Presentations to VIII Conference on Mechanical Response of Composites.
- 11
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Multi-Scale Modelling of Heterogenous Textile Composite Structures over Polytopal Tessellated Domains
I. Topalidis, B. El Said, A. Thompson, S. Hallett

Presentations to VIII Conference on Mechanical Response of Composites.
- 9
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Numerical Determination of the Effects of Out-of-Plane Waviness in Thermoplastic Matrix Laminates
C. Fougerouse, C. Fagiano, M. Hirsekorn, F. Laurin, M. Desailloud, M. Herman

Presentations to VIII Conference on Mechanical Response of Composites.
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Homogenization of Fiber Reinforced Elastomer Laminates
T. Ceglar, H. Pettermann

Presentations to VIII Conference on Mechanical Response of Composites.
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A Viscoelastic Cohesive Law for Rate and Temperature Dependent Mixed Mode Delamination
G. Sengodan, G. Allegri, S. Hallett

Presentations to VIII Conference on Mechanical Response of Composites.
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Local Fibre Orientation and Fibre Volume Fraction Mapped Numerical Models Based on X-ray Computer Tomography Scans
R. Auenhammer, L. Mikkelsen, C. Oddy, R. Larsson, L. Asp

Presentations to VIII Conference on Mechanical Response of Composites.
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Quasi-Isotropic Carbon-Carbon Hybrid Laminate: Static and Low-Cyclic Performance
S. Sapozhnikov, M. Gundappa, S. Lomov, Y. Swolfs, V. Carvelli

Presentations to VIII Conference on Mechanical Response of Composites.
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Damage Modelling in Sublaminate Scale with Higuer Order Elements in Explicit Dynamics
J. Selvaraj, L. Kawashita, A. Melro, S. Hallett

Presentations to VIII Conference on Mechanical Response of Composites.
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Early Stage Temperature Conditions Influence on Micromechanical Features of Thermoset Polymer-based Composite
J. Vorel, V. Hrbek, M. Sejnoha

Presentations to VIII Conference on Mechanical Response of Composites.
- 7
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A Two-dimensional Numerical Strategy for Computing Self-healing Ceramic Matrix Composites Lifetime
G. Bellezza, G. Couegnat, M. Ricchiuto, G. Vignoles

Presentations to VIII Conference on Mechanical Response of Composites.
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Numerical Analysis of Fatigue Damage Behavior in Fiber Composites under Different Block Loading Conditions
M. Brod, A. Dean, S. Scheffler, M. Bishara, R. Rolfes

Presentations to VIII Conference on Mechanical Response of Composites.
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A Mechanism-based Thermo-Viscoelastic Constitutive Law for Fiber Reinforced Polymer Matrix Composites
L. Di Gennaro, F. Daghia, M. Olive, F. Jacquemin, D. Espinassou

Presentations to VIII Conference on Mechanical Response of Composites.
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Second-order Computational Homogenisation for Thick Shell Models: Application to Non-linear Multiscale Analysis of Composites
A. Hii, B. El Said, S. Hallett

Presentations to VIII Conference on Mechanical Response of Composites.
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Accelerating two-scale Simulations with a Non-intrusive Reduced Order Model
T. Guo, K. Veroy

Presentations to VIII Conference on Mechanical Response of Composites.
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Cohesive Zone Based Conformal Meshing and Damage Simulation of Yarn Contacts in Woven Composites
A. Li, B. Wintiba, J. Remmers, M. Geers, T. Massart

Presentations to VIII Conference on Mechanical Response of Composites.
- 12
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Computation-Guided Multifunctional Design of Structural Battery Composites
D. Carlstedt, K. Runesson, L. Asp

Presentations to VIII Conference on Mechanical Response of Composites.
- 11
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Numerical - Experimental Approach for the Correlation Structure Determination of Short Fiber Reinforced Structures
N. Rauter, I. Widera, R. Lammering

Presentations to VIII Conference on Mechanical Response of Composites.
- 12
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Simulation Supported Development of Lightweight Panels with High Delamination Resistance
M. Pham, M. Vorhof, T. Gereke, G. Hoffmann, C. Cherif

Presentations to VIII Conference on Mechanical Response of Composites.
- 11
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Correlation Analysis of the Elasto-Plastic Behavior for Short Fiber-Reinforced Composites
N. Rauter, C. Reina

Presentations to VIII Conference on Mechanical Response of Composites.
- 5
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Methodology for Prediction of Transverse Crack Saturation Density and Diffuse Delamination Onset in Laminates
M. Shevchuk, C. Schuecker

Presentations to VIII Conference on Mechanical Response of Composites.
- 10
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Revised Boundary Conditions for FE-MD Multiscale Coupling of Amorphous Polymers
M. Ries, Y. Jain, P. Steinmann, S. Pfaller

Presentations to VIII Conference on Mechanical Response of Composites.
- 25
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Virtual Testing Integration and Material Allowables Generation
S. Miot, L. Barriere, J. Casero, M. Lozzo

Presentations to VIII Conference on Mechanical Response of Composites.
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Towards a Normative Protocol for Dynamic Shear Tests on [±45°] CMO Specimens: Geometry Validation
J. Berton, F. Coussa, J. Berthe, E. Deletombe, M. Brieu

Presentations to VIII Conference on Mechanical Response of Composites.
- 10
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Optimization of Thermoelastic Two-Phase Composites Using Analytical and Numerical Homogenization
K. Bieniek, K. Kowalczyk-Gajewska

Presentations to VIII Conference on Mechanical Response of Composites.
- 13
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Scalable Localized Model Order Reduction Applied to Composite Aero-Structures
J. Benezech, L. Seelinger, T. Dodwell, P. Bastian, R. Scheichl, R. Butler

Presentations to VIII Conference on Mechanical Response of Composites.
- 16
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An Interval-Based Approach for the Computation of Uncertainty in the Micromechanical Properties of Unidirectional Composite Materials
D. Sotiropoulos, K. Tserpes

Presentations to VIII Conference on Mechanical Response of Composites.
- 16
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Numerical Analisys of Guided Ultrasonic Wave Propagation in Fiber Metal Laminates
A. Mikhaylenko, N. Bellam-Muralidhar, N. Rauter, D. Lorenz, R. Lammering

Presentations to VIII Conference on Mechanical Response of Composites.
- 11
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Computational Modelling of Failure Mechanisms in Fibre Metal Laminates
I. Abuzayed, J. Curiel-Sosa, A. Saadi

Presentations to VIII Conference on Mechanical Response of Composites.
- 11
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Comparison of Computational Techniques for Prediction of Delamination Initiation and Propagation in Composite Laminates
F. Hamzah, N. Wirawan, F. Cepero, J. Curiel-Sosa

Presentations to VIII Conference on Mechanical Response of Composites.
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Continuum Damage Micromechanics Model for the Compressive Failure of Flax Fiber Composites and Experimental Validation
V. Tojaga, A. Prapavesis, J. Faleskog, T. Gasser, A. Vuure, S. Östlund

Presentations to VIII Conference on Mechanical Response of Composites.
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Mapping 3D Textiles onto their Models
M. Rubino, Y. Wielhorski, J. Schneider, A. Mendoza, S. Roux

Presentations to VIII Conference on Mechanical Response of Composites.
- 11
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Damping in CFRP Structures: Modelling and Comparison of Technological Solutions Using Elastomer
Y. Archi, N. Lahellec, S. Lejeunes, A. Jouan, B. Tranquart

Presentations to VIII Conference on Mechanical Response of Composites.
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On the Numerical Modeling and Validation of Fracture Mechanics for Printed Electronics Composites.
M. Linke, T. Genco, R. Lammering

Presentations to VIII Conference on Mechanical Response of Composites.
- 10
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Multi-Scale Virtual Testing of an Automatic Fibre Placed Orthogrid Fuselage Panel
J. Vroon, N. van Hoorn, W. van den Brink

Presentations to VIII Conference on Mechanical Response of Composites.
- 12
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Advanced isogeometric simulations of coupled problems
A. Reali

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).
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Physics-based and data-driven hybrid modeling: when data enrich models and models render data smarter
F. Chinesta, E. Cueto, J. Duval

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).
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Partitioned Analysis: Advances during 2001-Present and Future Challenges
K. Park

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).
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Developments in additive manufacturing processes: industrial technologies and numerical analyses
M. Chiumenti

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).
- 7
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Model Selection and Coupling in the Context of Biomedical Device Design
M. Behr, A. Ranno, M. Schuster

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).
- 10
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Multiscale multiphysiology predictive models of brain
D. Calvetti

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).
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Microstructured porous material models for damage induced by fluids in compressed rocks
A. Pandolfi

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).
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The thick strip method for slender body fluid structure interaction
S. Sherwin, M. Lahooti, Y. Bao, M. Graham, R. Palacios

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).
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Material Cost Optimization and Quality Control Improvement of Building Construction
S. Tesema, W. Ararsa, J. Chimdi, E. Quezon

Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University (2021). Sori Tesema, Woyesa Ararsa, Jifara Chimdi and Emer T. Quezon. Material Cost Optimization and Quality Control Improvement of Building Construction. Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University. VOLUME 15, ISSUE 8, 2021, 520- 541

Abstract
A building construction project cannot be completed successfully by only planning and scheduling. Project controlling that consists of project monitoring and updating, is the other critical stage. Construction materials cost and quality are becoming a severe problem in Ethiopia, especially in Ambo Town, where little consideration is given. The study tried to evaluate different factors affecting the materials cost and quality on building construction site, rank significant factors that are prevalently affecting the cost and quality of materials used for building projects from the point of view of the respondents, and established a model to optimize materials cost and materials quality using multilinear regression method to come up with the model best fit. Purposive sampling was used, and 180 questionnaires were administered to building construction firms to analyze Material cost Optimization and quality control ImprovementCase Study of Ambo Town. To achieve this, a questionnaire survey containing factors affecting Building construction material cost and quality, which were identified by literature and Interview, was analyzed by using the Relative Importance Index, Pearson's correlation, and Multilinear regression model. Variables are statistically significant at 95% confidence level is assessed that all of the independent variables are positively related to Building Construction material cost and quality. The RII results showed that Material Wastage minimization (RII = 0.908), Proper workmanship (RII= 0.859), Sufficient Training of workers/staff (RII = 0.876), Proper forecasting of materials price in the market (RII = 0.850), Using suitable, safe and secure storage (RII = 0.886), Quality checking for each delivery of the aggregates to the site (RII = 0.889), Cutting of materials ( glass, tiles, plywood) (RII = 0.870) and Design changes (RII = 0.770) were ranked as the most significant among factors affecting building construction materials. Also, two Multiple linear regression models were established for both dependent variables (material cost and material quality). The analysis results showed all independent variables were significant and had a strong positive relationship with dependent variables. The values of R2 for the developed equations indicated 0.771 for material cost and 0.777 for material quality. Hence, the basic recommendations such as planning and monitoring construction activities and inspection and verification of materials were anticipated to be exercised by key role players of the construction industry.
Abstract
A building construction project cannot be completed successfully by only planning and scheduling. Project controlling that consists of project monitoring and updating, is [...]
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A comprehensive review on structural joining techniques in the marine industries_July 2021 (IAMaC 2021)
F. Portugal), A. Akhavan-Safar, A. Barbosa, R. Beygi, D. Cardoso, R. Carbas, E. Marques, L. Silva

(2021). This poster was presented on 29-30 July 2021 at the IAMaC 2021 (1st Ibero-american Conference on Composite Materials)

Abstract
Since many modules of a ship cannot be practically reduced to a single structure, joining technologies are employed to join various substructures and transfer loads between the different components. These joining methods include welding, mechanical fastening, adhesive bonding, overlamination, and hybrid joining. In the current study, a comprehensive review has been conducted on the mechanical performance of the common joining techniques in the marine industry. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 101006860 (FIBRE4YARDS project).
Abstract
Since many modules of a ship cannot be practically reduced to a single structure, joining technologies are employed to join various substructures and transfer loads between [...]
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A comprehensive review on structural joining techniques in the marine industries_July 2021 (AB 2021)
F. Portugal), A. Akhavan-Safar, A. Barbosa, R. Beygi, D. Cardoso, R. Carbas, E. Marques, L. Silva

(2021). This poster was presented on 8-9 July 2021 at the AB 2021 (6th International Conference on Adhesive Bonding)

Abstract
Since many modules of a ship cannot be practically reduced to a single structure, joining technologies are employed to join various substructures and transfer loads between the different components. These joining methods include welding, mechanical fastening, adhesive bonding, overlamination, and hybrid joining. In the current study, a comprehensive review has been conducted on the mechanical performance of the common joining techniques in the marine industry. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 101006860 (FIBRE4YARDS project).
Abstract
Since many modules of a ship cannot be practically reduced to a single structure, joining technologies are employed to join various substructures and transfer loads between [...]
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Effect and Suitability of Calcined Montmorillonite Clay Powder and Waste Khat Husk Ash in the Strength and Durability of C-25 Concrete and its Benefits Cost Analysis
G. Wakoya, E. Quezon, W. Ararsa, J. Chimdi, D. LEMU

JSC Matls. Proj. Mangt. (2021). 1

Abstract
{| style="width: 100%;" |- | style="vertical-align: top;"|''Some environmental issues are industrial wastes and cement productions, which cause high gas emissions. Cement is vital in the global construction industry. The research goal was to find a cheaper material locally. Using OPC, calcined Montmorillonite clay powder (CMMT) and waste Khat Husk Ash (KHA) were tested as a partial replacement. Water entering the interlayer molecular spaces and adsorption, a material in expansive soil, causes Montmorillonite clay to expand more than other clays. Most of Ambo's land is expansive soil, from which samples were taken to determine Montmorillonite clay content. The average temperature required to calcine MMT clay was performed at 8000C using a muffle furnace, ground to the fineness of 150μm, and its chemical composition was investigated. Similarly, the waste KH was heated at a temperature of 6000C. The proportions by weight are applied for the OPC, Calcined MMT clay powder and Waste Khat Hush Ash as follows: Proportion-A (100%: 0%: 0%); P-B (85%:10%:5%); P-C (75%:20%:5%); P-D (65%:30%:5%); P-E (55%:40%:5%) and P-F (45%:50%:5%). The production of concrete for the C-25 Grade mix design was performed based on the ASTM manual, ERA manual, and the ACI code to evaluate the strengths and durability of concrete. These materials were calcined and then tested for strength and durability using ASTM C 618-5 to determine the chemical compounds at various temperatures. The experiments used aggregates up to 25mm in size. The results showed that when OPC was partially replaced with Calcined MMT clay powder and KHA, the consistency and setting time remained within the ASTM C-191 Standard Specifications. Moreover, the compressive, flexural, and split tensile strengths gradually decreased from the control specimen as the replacement was increased. The optimal amount of calcined MMT clay powder and Waste KHA indicated up to 15% by weight to replace OPC content in normal concrete mix production. The benefit cost analysis revealed that using OPC with calcined MMT clay powder and KHA is more cost-effective than using OPC alone.'' | style="vertical-align: top;"|'''ARTICLE HISTORY''' Received: xxxxx 2021 Accepted: xxxx 2021
Abstract
{| style="width: 100%;" |- | style="vertical-align: top;"|''Some environmental issues are industrial wastes and cement productions, which cause [...]
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Effect and suitability of calcined Montmorillonite clay powder and waste Khat Husk Ash in the Strength and Durability of C-25 concrete and it's Benefits Cost analysis
G. Wakoya

Gamachu Wakoya's personal collection (2021). 1

Abstract
Some environmental issues are industrial wastes and cement productions, which cause high gas emissions. Cement is vital in the global construction industry. The research goal was to find a cheaper material locally. Using OPC, calcined Montmorillonite clay powder (CMMT) and waste Khat Husk Ash (KHA) were tested as a partial replacement. Water entering the interlayer molecular spaces and adsorption, a material in expansive soil, causes Montmorillonite clay to expand more than other clays. Most of Ambo's land is expansive soil, from which samples were taken to determine Montmorillonite clay content. The average temperature required to calcine MMT clay was performed at 800℅ using a muffle furnace, ground to the fineness of 150μm, and its chemical composition was investigated. Similarly, the waste KH was heated at a temperature of 600℅ . The proportions by weight are applied for the OPC, Calcined MMT clay powder and Waste Khat Hush Ash as follows: Proportion-A (100%: 0%: 0%); P-B (85%:10%:5%); P-C (75%:20%:5%); P-D (65%:30%:5%); P-E (55%:40%:5%) and P-F (45%:50%:5%). The production of concrete for the C-25 Grade mix design was performed based on the ASTM manual, ERA manual, and the ACI code to evaluate the strengths and durability of concrete. These materials were calcined and then tested for strength and durability using ASTM C 618-5 to determine the chemical compounds at various temperatures. The experiments used aggregates up to 25mm in size. The results showed that when OPC was partially replaced with Calcined MMT clay powder and KHA, the consistency and setting time remained within the ASTM C-191 Standard Specifications. Moreover, the compressive, flexural, and split tensile strengths gradually decreased from the control specimen as the replacement was increased. The optimal amount of calcined MMT clay powder and Waste KHA indicated up to 15% by weight to replace OPC content in normal concrete mix production. The benefit cost analysis revealed that using OPC with calcined MMT clay powder and KHA is more cost-effective than using OPC alone.
Abstract
Some environmental issues are industrial wastes and cement productions, which cause high gas emissions. Cement is vital in the global construction industry. The research goal [...]
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The Russian Crisis Communication Response beyond MH17 Tragedy
M. Arandas, L. Ling

The Russian Crisis Communication Response beyond MH17 Tragedy (2021). The European Proceedings of Social & Behavioural Sciences

Abstract
Effective crisis communication response through using the proper strategies is critical to cope with crises and to protect the reputation and existence of the involved parties. Usually, aviation accidents receive great attention from the media and the public. Malaysia Airlines Flight 17 (MH17) which was shot down over eastern Ukraine on 17 July 2014 during its scheduled flight from Amsterdam to Kuala Lumpur received global attention. This attention was due to the involvement of several countries either at the level of the countries of victims or the countries accused of the attack. Image repair theory proposed by William Benoit, the widely used in crisis communication response was implemented in this study. The Russian response to the international accusation, especially from the Western world on supporting the attackers of MH17 has been examined in this study. This study implemented both quantitative and qualitative content analysis to achieve its aims. A total of 306 news stories from the online New Straits Times newspaper Website from the years 2014 to 2019 were analysed. A total of 191 strategies were included in 123 news stories since some stories combined more than a strategy. Out of 191 strategies, 43.5% were simple denial, followed by shift the blame and attack accuser with 35.1% and 21.5% respectively. The results revealed that the image repair effort by Russia was effective and successful. Keywords: Crisis communication, image repair, MH17, response strategies, Russia
Abstract
Effective crisis communication response through using the proper strategies is critical to cope with crises and to protect the reputation and existence of the involved parties. [...]
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Newspaper advertising for public relations practitioners during the Malaya era 1957-1963
C. Kee, M. Arandas, S. (PhD)

Newspaper advertising for public relations practitioners during the Malaya era 1957-1963 (2020). Asia Pacific Public Relations Journal

Abstract
The very first recruitment for a public relations practitioner in Malaysia was encountered in 1948 and was advertised by the federal government of the British Colony in Malaya. This paper examines the subsequent advertisements after Malaya sought independence from the British colonial government. A total of eleven recruitment advertisements were found before the formation of Malaysia on the 16th September 1963. This paper outlines the advertisers, the titles of positions, as well as their qualifications and duties. The results show that the job requirement mainly came from the federal and local governments. Generally, the duties were related to information services and some specific responsibilities. Keywords: public relations; advertising; Straits Times; Malaya
Abstract
The very first recruitment for a public relations practitioner in Malaysia was encountered in 1948 and was advertised by the federal government of the British Colony in Malaya. [...]
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Indonesian Crisis Communication Response after Deliberate Forest Fires and Transboundary Haze
M. Arandas, L. Ling

Indonesian Crisis Communication Response after Deliberate Forest Fires and Transboundary Haze (2020). Jurnal Komunikasi: Malaysian Journal of Communication

Abstract
The issue of deliberate forest fires that set illegally in Indonesia by plantation companies in their slash and-burn forests to clear lands for lucrative palm oil plantations and its caused transboundary haze became a hot issue for discussion. These fires have a negative influence on Indonesia and its neighbourhood countries, especially on their financial and human resources such as environment, economy, properties, and people. Using the right strategies in responding to any crisis determines the success of its management and coping with that crisis with minimal losses. This study aimed to examine the communication crisis response by Indonesia to this crisis by using image repair theory. Also, this study examined how image repair strategies were used by Indonesia. This study analysed the content of news stories from the website of the New Straits Times newspaper. The time frame of this study was from 2015 to 2019. A total of 87 news stories have pertained to Indonesian response, and 37 stories included image repair strategies. Among the strategies of image repair theory, corrective action strategy was the most dominant with 70%, followed by 10.8% for each shift the blame and attack accuser. The least used strategies were mortification and simple denial with 5.4% and 2.7% respectively. Keywords: Indonesia, crisis communication, image repair, transboundary haze, deliberate fires
Abstract
The issue of deliberate forest fires that set illegally in Indonesia by plantation companies in their slash and-burn forests to clear lands for lucrative palm oil plantations [...]
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Reliance, Media Exposure and Credibility
C. (IPPTAR), M. Arandas

International Conference on Media and Communication (MENTION 2019)

Abstract
This study discusses credibility of both the traditional and social media from the audience perspective. Numerous definitions and conceptualisations of media credibility are either source or medium based but there are also numerous measurements made on the concept that gave rise to varied findings. An attempt was made to associate the concept of credibility with media exposure, postulating that the greater use of media would mean greater credibility. Two studies were made involving a total of 4095respondents with 1544 questionnaires distributed in April 2019, and 2551questionnaires in January 2018 to investigate the concept of credibility and its correlate with media use. The first period was before the General Elections but the April 2019 study was made after the May General Election giving an idea how credibility could have changed under a new government. The results of this study revealed that Malaysians perceived the traditional media, including TV, radio, and newspapers, were more credible than the new media (internet, online news portals, Facebook, and Twitter). TV was perceived to have the highest credibility, while Twitter, the lowest credibility. The social media suffered low credibility due to the surrounding discussions on fake news, false information, and post-truth issues. The sources of content in the traditional media are mostly known or verified, unlike that of the new media, thus paving for the poor evaluation of credibility of the new media. Keywords: Media credibility, traditional media, new media, media exposure, Malaysia
Abstract
This study discusses credibility of both the traditional and social media from the audience perspective. Numerous definitions and conceptualisations of media credibility are [...]
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Framing the First Palestinian General Elections by Malaysia’s New Straits Times
M. Arandas

Framing the First Palestinian General Elections by Malaysia’s New Straits Times (2019). Jurnal Komunikasi: Malaysian Journal of Communication

Abstract
The main focus of this study is the coverage of New Straits Times (NST) of the first Palestinian General Elections for two presidential candidates namely, Yasser Arafat and Samiha Khalil. This study aimed to explore if any of Entman’s 1993 framing functions was used in the coverage of this issue and to explore whether the tone of NST coverage was negative, positive, balanced or neutral. To achieve the aims of this study, qualitative content analysis of elections stories from NST has been adopted. The number of news stories was eight, and the time frame started from 19th January to 13th February 1996, where three of these stories were published on the same day of 22nd January, two days after holding the elections on 20th January. Defining problems and diagnosing causes werethe most prominent of Entman’s four framing functions presented in all the articles. The moral judgment function was included in four news stories, and suggesting remedies was included in two news stories out of eight. The findings revealed that Yasser Arafat received 50% balanced coverage, followed by 37.5% positive coverage, and only 12.5% negative coverage, while Samiha Khalilreceived 67% balanced coverage, compared to 33% positive coverage. Keywords: Arafat, framing, media coverage, Palestine, presidential elections
Abstract
The main focus of this study is the coverage of New Straits Times (NST) of the first Palestinian General Elections for two presidential candidates namely, Yasser Arafat and [...]
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Exploring the Needs and Expectations of International Students towards The National University of Malaysia (UKM)
M. Arandas, L. Ling, S. Sannusi

Exploring the Needs and Expectations of International Students towards The National University of Malaysia (UKM) (2019).

Abstract
This study demonstrates main reasons for choosing The National University of Malaysia (UKM) by international students and their needs and expectations toward the University. The study also shows the obstacles faced by those students and their satisfaction towards UKM. A total of 108 questionnaires were distributed in the main campus to the respondents who came from ten diffident countries. The main reasons for choosing UKM were its high ranking, reasonable tuition fees, faculty, programmes, and lecturers respectively. The results revealed that the main obstacles faced international students were tough visa procedures, improper hostels, social isolation and discrimination, and bureaucracy. Both the facilities and services of UKM and the studying approach have met the expectations satisfaction of international students. Yet, both social relationship and participation in activities and living conditions in UKM hostels have disappointed international students and did not meet their satisfaction. This study suggested that UKM should establish counselling unit and organise regular meetings to listen to the problems and suggestions of those students. Volunteer and pre-enrolment activities should be organised to introduce the Malaysian culture and gather international students with their local peer. Moreover, international students should be provided upon their arrival to UKM by hostels that combine proper conditions of living at a reasonable price. Keywords: international students, expectations, needs, satisfaction, internationalisation, intercultural communication
Abstract
This study demonstrates main reasons for choosing The National University of Malaysia (UKM) by international students and their needs and expectations toward the University. [...]
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Framing the Reaction of President Abbas on the Issue of Moving the US Embassy from Tel Aviv to Jerusalem
M. Arandas, C. Kee, E. Mohamad, S. IDID

Framing the Reaction of President Abbas on the Issue of Moving the US Embassy from Tel Aviv to Jerusalem (2018).

Abstract
The study has examined the similarities and differences in the coverage of two Palestinian news agencies Ma’an and Palestinian Information Center (PIC) on the reactions of Palestinian President Mahmoud Abbas’s regarding relocating the US embassy from Tel Aviv to Jerusalem. The study has also aimed to explore the use of four function of framing by Entman 1993 in the news stories of both agencies. Qualitative content analysis has been adopted to achieve the aim of this study. The total sampling number was 9 news stories; 3 stories have been retrieved from Ma’an, and the other 6 have been retrieved from PIC. The time frame has started from December 5, 2017 which marked the day of informing Abbas by Trump’s decision to move the Embassy until December 22 2017 which was a day after gaining a sweeping victory in UN by president Abbas through a resolution that rejected the decision. Both of the news agencies were supportive to President Abbas in their coverage and none of them has any negative coverage about him. From the sampling number it can be seen that PIC has paid more attention for the coverage of this issue than Ma’an. However, PIC has ignored the success of President Abbasfor achieving UN resolution against Trump’s decision. Moreover, all the news stories has included “define the problem” while excluded “diagnose causes” functions. However both“make moral judgment” and “suggest remedies” have been included in all news stories of Ma’an, and only half of news stories of PIC. Keywords: Abbas, Trump, US embassy, Jerusalem, Palestine
Abstract
The study has examined the similarities and differences in the coverage of two Palestinian news agencies Ma’an and Palestinian Information Center (PIC) on the reactions [...]
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Recruiting The Public Relations Officer During British Colonial Malaysia
S. (PhD), M. Arandas, C. (PhD)

Abstract
This is a study on the growth of public relations in Malaysia based on the advertisements placed in the newspapers during the colonial period. Tracing the historical development serves to make a better understanding about the nature of public relations practice. This paper therefore aims at exploring the development of the public relations profession by studying the advertisements placed in the nationwide newspapers, the Straits Times and the Singapore Free Press & Mercantile Advertiser from 1939 which included the early advertisement that contained the phrase “public relations” to 1956 a year before the independence of the Federation of Malaysia. An analysis of the advertisements was made to fully understand the historical development of public relations in Malaya or then Malaysia. Keywords: Public relations, public relations officer, recruiting, independence, Malaysia
Abstract
This is a study on the growth of public relations in Malaysia based on the advertisements placed in the newspapers during the colonial period. Tracing the historical development [...]
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Professional Values, Ethics, and Professionalism of Public Relations Practitioners
S. IDID, M. Arandas

Professional Values, Ethics, and Professionalism of Public Relations Practitioners (2016).

Abstract
This study explores the influence of education, length of service, professionalism, and ethics on the professional values of public relations practitioners in Malaysia. A total of 427 questionnaires were distributed to public relations practitioners in Malaysia, and 322 questionnaires were returned. The study included 61% female respondents, and 39% male respondents. The study analyzed and identified the influence of professionalism and ethics on professional values of public relations practitioners. Additionally, the study examined whether education and experience influence professional values through professionalism, and code of ethics. Six hypotheses were tested to answer the research questions. The results from this study fully supported the hypotheses indicating that professionalism and ethics had an influence on professional values of public relations practitioners. The results also showed that education influenced both professionalism and ethics, and length of service influenced both professionalism and ethical practice. Keywords: Professional values, public relations, practitioners, professionalism, code of ethics
Abstract
This study explores the influence of education, length of service, professionalism, and ethics on the professional values of public relations practitioners in Malaysia. A [...]
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A data-driven methodology for enhanced measurement and verification of energy efficiency savings in commercial buildings
B. Grillone, G. Mor Martinez, S. Danov, J. Cipriano, A. Sumper

Applied Energy (2021).

Abstract
Methods to obtain accurate estimations of the savings generated by building energy efficiency interventions are a topic of great importance, and considered to be one of the keys to increase capital investments in energy conservation strategies worldwide. In this study, a novel data-driven methodology is proposed for the measurement and verification of energy efficiency savings, with special focus on commercial buildings and facilities. The presented approach involves building use characterization by means of a clustering technique that allows to extract typical consumption profile patterns. These are then used, in combination with an innovative technique to evaluate the building’s weather dependency, to design a model able to provide accurate dynamic estimations of the achieved energy savings. The method was tested on synthetic datasets generated using the building energy simulation software EnergyPlus, as well as on monitoring data from real-world buildings. The results obtained with the proposed methodology were compared with the ones provided by applying the time-of-week-and-temperature (TOWT) model, showing up to 10% CV(RMSE) improvement, depending on the case in analysis. Furthermore, a comparison with the deterministic results provided by EnergyPlus showed that the median estimated savings error was always lower than 3% of the total reporting period consumption, with similar accuracy retained even when reducing the total training data available.
Abstract
Methods to obtain accurate estimations of the savings generated by building energy efficiency interventions are a topic of great importance, and considered to be one of the [...]
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Assessment on Materials Quality Control Implementation of Building Construction Projects and Workmanship: A Case Study of Ambo University
E. Quezon

Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University (2021).

Abstract
Quality of material issues have been a significant source of concern since the dawn of recorded history. Building materials are essential and should be performed according to standard specifications because they cover around 60% of the project cost. Prior to project construction, specific codes, standards, and specifications should be available. Using all required materials does not guarantee a sound building appearance or function. Even with suitable materials, workmanship, and supervision, unexpected output can affect a building. Quality workmanship is a comprehensive approach to bolstering building durability, serviceability, and safety. The study evaluated Ambo University's building construction materials and quality. Convenience and quota sampling techniques were collected from all contractors and consultants involved in building construction via questionnaires and interviews. A comprehensive literature review identified 15 major factors affecting building construction materials quality and workmanship, and respondents ranked them in the order of importance. Defects in existing buildings and ongoing projects had observed due to non-compliance with construction materials and workmanship based on specifications and standards. The results indicated that Ambo University building has no defect-free structure, including the degree and type of defects vary. A 94% of the studied buildings had moisture leakage, plastering defects, paint peeling, and cracks. Hence, the consultants and Ambo University project representatives should adhere with the standard specifications, and must exercise their profession according to the ethical code of conduct. All of these, it will play a vital role in the success of construction projects.
Abstract
Quality of material issues have been a significant source of concern since the dawn of recorded history. Building materials are essential and should be performed according [...]
- 3
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Analysis of structure and starting characteristics of three-shaft ring-plate permanent magnet gear
Y. Ge, D. Liu

Rev. int. métodos numér. cálc. diseño ing. (2021). Vol. 37, (4), 44

Abstract
Combined with the transmission mode of cycloid permanent magnet gear and ring plate mechanical gear, a three-shaft ring-plate permanent magnet gear transmission structure (TRMG) is proposed. Operating mechanism of structure is given. TRMG simulation model is established and the correctness is verified by transient finite element method. Based on momentum moment theorem, TRMG start-up process and start-up position of are analyzed theoretically. By calculating TRMG torque impulse, the optimal start-up range and start-up position of TRMG are determined.
Abstract
Combined with the transmission mode of cycloid permanent magnet gear and ring plate mechanical gear, a three-shaft ring-plate permanent magnet gear transmission structure [...]
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Redirecting the design of an electrical engineering educational game to other disciplines
J. Ramirez, S. Rivera

Rev. int. métodos numér. cálc. diseño ing. (2021). Vol. 37, (4), 41

Abstract
This document describes the process of developing a game that simulates the fundamental aspects of a commercial establishment in charge of marketing and performing maintenance on electric motors, aimed mainly at Electrical Engineering students. The process begins with the coding of a software capable of simulating daily machinery buying and selling events, then its design was refined, including other elements that enrich the user experience. With these elements, you can make add-ons that allow you to simulate and document events in such a way that they can be used outside of your initial target audience.
Abstract
This document describes the process of developing a game that simulates the fundamental aspects of a commercial establishment in charge of marketing and performing maintenance [...]
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Python notebook usefullness, case study: Optimization techniques course
L. Rodriguez, C. Pardo, J. Cepeda, J. Gomez, S. Rivera

Rev. int. métodos numér. cálc. diseño ing. (2021). Vol. 37, (4), 42

Abstract
Online code sharing and documentation platforms have become an essential part of every analyst and data scientist’s lives. Google Colab and Jupyter Notebook are some of the well named platforms which are used quite extensively to work on datasets. These platforms allow the user to showcase and manipulate data along with the capabilities of adding beautiful visualizations and essential narrative texts. They offer high customization abilities for the users along with Collaboration and sharing capabilities. These notebooks also offer a variety of languages to choose from, like R, Python, PySpark etc. if the necessary packages are installed. Other platforms available for working on big data includes R Markdown, Kaggle, Spark Notebook and many other popular tools. With the recent developments in Data Science technologies and Machine learning, there has been an increased adoption for these platforms, which has eventually led to the addition of new features to these tools. JupyterLab is a web-based interactive development environment for Jupyter Notebook, codes as well as data. It has been designed to be flexible so as to incorporate any form of workflow into it pertaining to Data Science, Scientific Computing as well as Machine Learning & Artificial Intelligence. It also allows developers to write their own plugins and packages, which can then be easily incorporated into the workflows, i.e., seamless integration experience. Jupyter Notebook is a component of Lab which is an open-source web application that allows users to create and share documents containing live code, equations, visualizations and narrative text. Some of the use cases include data cleaning and transformation, numerical simulation, statistical modeling, and data visualization. Google Colab or short for Colaboratory is a product developed by Google Research, which is a free to use platform and can be used to execute arbitrary Python codes through the browser. This tool is especially suited for machine learning, data analysis as well as educational purposes. Colab is a hosted Jupyter Notebook service which requires no setup and provides free access to computing power like GPUs on the cloud. This is ofcourse extended if the user pays for the pro version called Colab Pro.
Abstract
Online code sharing and documentation platforms have become an essential part of every analyst and data scientist’s lives. Google Colab and Jupyter Notebook are some [...]
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Stackelberg game approach to a bi-objective robust design optimization
L. Dai, M. Tang, S. Shin

Rev. int. métodos numér. cálc. diseño ing. (2021). Vol. 37, (4), 40

Abstract
Robust design has received a great deal of attention from quality researchers in recent years, and a number of optimization methodologies based on the dual response format have been proposed. The majority of existing bi-objective optimization models concentrate on the trade-offs between the process mean and variability functions without investigating the interactions between control factors and quality characteristics. The primary objective of this research is to integrate the Stackelberg leadership model into the robust design procedure and propose a Stackelberg game-based robust design (SGRD) method to determine appropriate control factor settings by minimizing the values of desired optimization targets based on an analysis of possible combinations of input and output quality parameters. Herein, first, a bi-objective robust design optimization problem is formulated as a dual response model using response surface methodology (RSM). Second, the proposed SGRD model is developed via decomposition into two leader-follower game models. Finally, the mean square error (MSE) criterion is applied to evaluate models, and select non-dominated solutions in various situations. Numerical examples are used to demonstrate that the proposed method provides significant solutions in cases containing unidentified priorities between the dual responses and undiscovered correlations among several inputs and outcomes. In addition, according to the case study analysis, the proposed method is more efficient than the conventional dual response approach when dealing with bi-objective robust design optimization problems.
Abstract
Robust design has received a great deal of attention from quality researchers in recent years, and a number of optimization methodologies based on the dual response format [...]
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Seakeeping analysis of monohull ships at preliminary design using artificial neural networks
P. Tello, J. Gutiérrez Romero, B. Servan Camas

Abstract
Nowadays seakeeping is mostly analysed by means of model testing or numerical models. Both require of a significant amount of time and of the exact hull geometry, and this is why seakeeping is not taken into account at the early stages of ship design. Then, the main objective of this work is the development of a seakeeping prediction tool to be used in the early design. Hence this tool must be fast, accurate, and must not require the exact hull shape. To this end, an artificial intelligence (AI) algorithm has been developed. This algorithm is based on artificial neural networks (ANN) and only requires the ship coefficients of forms. The methodology developed to obtain the predictive algorithm is presented as well as the database of ships used for training the ANN. The training data were generated using a seakeeping code based on the boundary element method (BEM). Also, the AI predictions are compared to the BEM results using both, ship shapes from the training database and from outside. As a result it has been obtained an AI tool capable of predicting seakeeping almost instantly for a wide range of monohull merchant ships. And the difference in results, with respect to the BEM code used for the training, is lower than 5%.
Abstract
Nowadays seakeeping is mostly analysed by means of model testing or numerical models. Both require of a significant amount of time and of the exact hull geometry, and this [...]
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Research on missile consumption in wartime with the airport runway as the target
Q. Li, G. Chen, Z. Li, L. Xu, Z. Wei

Rev. int. métodos numér. cálc. diseño ing. (2021). Vol. 37, (3), 38

Abstract
To solve the problem of insufficient research on missile consumption in wartime with the airport runway as the target, this paper takes the airport runway as the target, taking the invalidation probability as the expected target, and adopting conventional missiles with submunitions. In combination with penetration and anti-missile countermeasures, this paper publicly proposes the consumption calculation method and model for the first time, and the multi-wave strikes strategy and calculation method are proposed either. The model is verified by combining the specific airport runway, fighter jet model and missile parameters. The experiment calculates the total consumption and the corresponding probability of destroying the target, as well as the total strike wave and the corresponding probability of destroying the target. The results prove the effectiveness and accuracy of the method and model, and provide an important basis for the sufficient amount of missiles to attack airport runways in wartime.
Abstract
To solve the problem of insufficient research on missile consumption in wartime with the airport runway as the target, this paper takes the airport runway as the target, taking [...]
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An Introduction to FIBREGY Project
J. García-Espinosa

FIBRE4YARDS OA (2021). Vol. FIBREGY & FIBRE4YARDS joint information day, 15

Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The overall objective of the FIBREGY project is to enable the extensive use of FRP materials in the structure of the next generation of large Offshore Wind and Tidal Power platforms. In order to achieve this objective, the project will develop, qualify and audit innovative FRP materials for offshore applications, elaborate new design procedures and guidelines, generate efficient production, inspection and monitoring methodologies, and validate and demonstrate advanced software analysis tools. Finally, the different developed technologies will be demonstrated by using advanced simulation techniques and building large and real-scale prototypes.
Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The overall objective of the FIBREGY project is to enable the [...]
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Design and Engineering for Vessel Production Improvement & Smart manufacturing approach for developing shipyard 4.0 strategy
D. Sa

Fibregy OA (2021). Vol. FIBREGY & FIBRE4YARDS joint information day, 11

Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The main objective of FIBRE4YARDS project is to maintain European global leadership in ship building and ship maintenance, through implementation of the Shipyard 4.0 concept in which advanced and innovative FRP manufacturing technologies are successfully introduced. This project has received funding from European Union's Horizon 2020 research and innovation programme under grant agreement n°101006860.
Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The main objective of FIBRE4YARDS project is to maintain European global leadership [...]
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Current state and interests of EU shipyards in composite production processes.
M. Dolz

Fibregy OA (2021). Vol. FIBREGY & FIBRE4YARDS joint information day, 10

Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The main objective of FIBRE4YARDS project is to maintain European global leadership in ship building and ship maintenance, through implementation of the Shipyard 4.0 concept in which advanced and innovative FRP manufacturing technologies are successfully introduced. This project has received funding from European Union's Horizon 2020 research and innovation programme under grant agreement n°101006860.
Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The main objective of FIBRE4YARDS project is to maintain European global leadership [...]
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New production processes to be implemented in the FIBRE4YARDS project
R. Pereira

Fibregy OA (2021). Vol. FIBREGY & FIBRE4YARDS joint information day, 9

Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The main objective of FIBRE4YARDS project is to maintain European global leadership in ship building and ship maintenance, through implementation of the Shipyard 4.0 concept in which advanced and innovative FRP manufacturing technologies are successfully introduced. This project has received funding from European Union's Horizon 2020 research and innovation programme under grant agreement n°101006860.
Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The main objective of FIBRE4YARDS project is to maintain European global leadership [...]
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FIBRE4YARDS: Project Overview
X. Martinez

Fibregy OA (2021). Vol. FIBREGY & FIBRE4YARDS joint information day, 8

Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The main objective of FIBRE4YARDS project is to maintain European global leadership in ship building and ship maintenance, through implementation of the Shipyard 4.0 concept in which advanced and innovative FRP manufacturing technologies are successfully introduced. This project has received funding from European Union's Horizon 2020 research and innovation programme under grant agreement n°101006860.
Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The main objective of FIBRE4YARDS project is to maintain European global leadership [...]
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FIBRE4YARDS Project Overview
X. Martinez

FIBRE4YARDS OA (2021). Vol. FIBREGY & FIBRE4YARDS joint information day, 13

Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The main objective of FIBRE4YARDS project is to maintain European global leadership in ship building and ship maintenance, through implementation of the Shipyard 4.0 concept in which advanced and innovative FRP manufacturing technologies are successfully introduced. This project has received funding from European Union's Horizon 2020 research and innovation programme under grant agreement n°101006860.
Abstract
This presentation was held at the FIBREGY & FIBRE4YARDS joint info day on July 1st, 2021. The main objective of FIBRE4YARDS project is to maintain European global leadership [...]
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Machine Learning for Friction Stir Welding Process
A. Mishra

(2021). Amazon Kindle Direct Publishing

Abstract
Book on the application of Machine Learning in Friction Stir Welding process. Available on Amazon.
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Unsteady Interaction of Aerodynamics with Wing Structure in Gust Load Control
N. Qin

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
In this presentation, I will first introduce some recent work on the various ways to control the unsteady wing load induced by gust encounter. This is crucially important for the safety of future civil aviation. In addition, the effective alleviation of gust load can also potentially pave the way for a significant reduction of aircraft fuel consumption through reduced structural weight and therefore drag. Since no practical wing is rigid, this leads to a strongly-coupled problem between the wing aerodynamics and its structure under the unsteady gust load. The solution of this coupled problem will discussed in some detail, including the analysis of the unsteady gust response without and with flow control.
Abstract
In this presentation, I will first introduce some recent work on the various ways to control the unsteady wing load induced by gust encounter. This is crucially important [...]
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THE MECHANICAL ANALYSIS OF HDPE NET CAGE BY TEST AND CALCULATION
H. Liu, X. Huang, T. Yuan, Y. Hu, J. Guo, G. Pang

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
To reduce the structural failure risk of net cages under extreme sea conditions, this study analysed the yield phenomenon under mooring constraints and excessive or long-term wave loads. The floating collar deforms by shear when a twisted 1 m for the 8-point type and 5 m for the four point type. The structural strength in the Z-vertical direction is one-fifth of that in the X-horizontal direction. The maximum deformation is mainly on the two ends of the cap ned pipes. The critical points of the guardrail may reach the yield stress when the wave height is 1.1 m, while the height of the floating pipe is 5 m. The float can be damaged more easily when there is torsion or shear deformation caused by irregular waves. The results provide guidelines for the optimised structural design of net cages, which by increasing the number of mooring points and cap neds as well as reducing the welding points and structural mutation points, can improve the ultimate bearing capacity and fatigue reliability of the cage float.
Abstract
To reduce the structural failure risk of net cages under extreme sea conditions, this study analysed the yield phenomenon under mooring constraints and excessive or long-term [...]
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Determination of the optimal positions of the supports of a homogeneous plate under non-stationary action
N. Lokteva, S. Borshevetskiy

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
In this work, a study of micrometeoroid protection (MMP) is carried out. It is a thinwalled shell designed to protect the equipment on the nose of the spacecraft from micrometeorites. However, an equally dangerous equipment is posed by an astronaut who can accidentally affect the shell during repair work and damage the equipment. To counteract this, the shell is specially supported by supports from the inside. To develop a method for calculating the number of supports and their position, a simplified version of the problem is considered. The interaction of a plate hinged along the edges and having additional supports over the area with a special load in the form of a non-stationary Delta function is studied. The KirchhoffLowe plate was chosen as the model of the plate. The origin is placed at the top left corner of the plate. It is required to determine the optimal location of additional supports, based on the fact that the maximum deflection should not allow the maximum permissible value. The deflection function is defined as the sum of the convolutions of the influence functions with the corresponding external load and reactions in the additional supports. To determine the value of the influence function, all functions included in the expressions for the motion of the plate are expanded into Fourier series in such a way that the boundary conditions at the edges of the plate are satisfied and the Laplace transform in time is applied. Further, in the equation of motion of the plate, both the external load and the convolution of the Delta function with reactions in additional supports and in time are taken into account. The values of the reactions in the supports are determined from the boundary conditions, based on the fact that the displacements of the fixed points are equal to zero. After that, from the obtained equation of normal displacements, the coordinates of the location of the supports around the applied external load are determined, so that the condition of not exceeding the specified displacement value is satisfied. The normal displacements are determined, the inverse Laplace transform is performed in time, and the sum of the series is found.
Abstract
In this work, a study of micrometeoroid protection (MMP) is carried out. It is a thinwalled shell designed to protect the equipment on the nose of the spacecraft from micrometeorites. [...]
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The inverse transient problem of identifying the law of change in the cross-sectional area of an elastic bar
G. Fedotenkov, E. Starovoitov, Y. Vahterova

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
The main goal of investigations is to obtain solutions for new inverse transient problems of elastic bars. The research objective is to develop and realize new methods, approaches and algorithms for solving inverse transient problems of bar mechanics. The direct transient task for elastic bar consists in determining elastic displacements, which satisfies a given equation of transient oscillations in partial derivatives and some given initial and boundary conditions. The solution of inverse problem with a completely unknown space-time law of load distribution is based on the method of influence functions. With its application the inverse problem is reduced to solving a system of integral equations of the Volterra type of the first kind in time with respect to the sought external axial load of the elastic bar. To solve it, the method of mechanical quadratures is used in combination with the Tikhonov regularization method.
Abstract
The main goal of investigations is to obtain solutions for new inverse transient problems of elastic bars. The research objective is to develop and realize new methods, approaches [...]
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Mechanical Constraint Arrangement and Its Multibond Graph Representation
I. Kosenko

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
When developing a computer model of the multibody system (MBS) dynamics it is interesting to have a unified technology to construct the models in an efficient way. It turns out object-oriented approach provides a tools to resolve such a problem successively step by step. One of these unified ways is connected tightly with the so-called multiport representation of the models initially based on the bond graph use. These latter ones in turn based on the idea of energy exchanges, and substantially on energy conservation for physically interconnected subsystems of any engineering type. A detailed description of the multibond graph representation for the most general type of constraint is presented. It turned out the resulting total multibond graph model of the multibody system dynamics always has exactly a canonical junction structure. This representation has a tight correspondence with our previous object-oriented implementation of the mechanical constraint architecture. Computational experience makes it possible to classify objects of the multibody system dynamics. Such a model includes two classes of objects. They correspond to notions of 'body' and 'constraint'. Each of these notions indeed corresponds to the certain type of the multibond graph junction.
Abstract
When developing a computer model of the multibody system (MBS) dynamics it is interesting to have a unified technology to construct the models in an efficient way. It turns [...]
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Influence of the Combined Dry Friction on the Dynamics of the Rigid Ball Moving Along Two parallel Rails
A. Kireenkov

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
The extended and improve version of the investigation described in [1-2] and the firstly presented in [3] is proposed in this work. Distinguish features of these investigations are applications of the theory of multi-component dry friction [4-16] in the problem of the ball rolling on boundaries of two identical frames. Father development of this model can be used in investigation of the dynamic of the a so-called 'Butterfly' robot, consisting of two identical shaped plates rigidly placed parallel to each other on a small distance aimed at manipulating a ball that can freely roll on the plates' boundaries as on rails [17]. The difficult control systems considered in [18-20] are another engineering application of the combined dry theory. Following developed in previous investigation approach, the friction force and torque are computed by the integration over the contact area so that the exact dynamically coupled integral model accounting the relationship of all the components of friction is obtained. This exact model is replaced by approximated analytical model [1-2] which is completely satisfy to all analytical properties of integral model as function kinematics parameters without increasing the number of coefficients.
Abstract
The extended and improve version of the investigation described in [1-2] and the firstly presented in [3] is proposed in this work. Distinguish features of these investigations [...]
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Modeling an unsteady elastic diffusion processes in a Timoshenko plate.
A. Zemskov, D. Tarlakovskii, N. Grigorevskiy

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
We investigated unsteady elastic diffusion vibrations of a rectangular isotropic Timoshenko plate. For the mathematical problem formulation, a model of coupled elastic diffusion processes in a multicomponent continuum is used. Using the d'Alembert variational principle, the equations of transverse vibrations of a rectangular isotropic Timoshenko plate taking into account diffusion are obtained from this model. An initialboundary value problem of a simply supported plate bending is formulated.
Abstract
We investigated unsteady elastic diffusion vibrations of a rectangular isotropic Timoshenko plate. For the mathematical problem formulation, a model of coupled elastic diffusion [...]
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Quadcopter with thrust vector control based on Scotch yoke
S. Semendyaev

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
People are interested in quadcopters (or quadrotors) because of flight maneuverability and a variety of applications. Standard quadrotor has constant mechanical structure frame with four motors and four rotors (propellers), and usually, rotors do not change the angle of the rotation axis relative to the frame. However, there are several designs in which the axis of rotation of rotors changes the angle relative to the frame (for example, 'Holocopter' and 'Tilt-rotor'), and this option changes the thrust vector of the quadcopter. In this work a novel design of thrust vector control based on the Scotch yoke is proposed. All rotor axes incline simultaneously in any direction by only two servos. Construction design is proposed, and general dynamics are described.
Abstract
People are interested in quadcopters (or quadrotors) because of flight maneuverability and a variety of applications. Standard quadrotor has constant mechanical structure [...]
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Feedback control for coupled systems by kernel surrogates.
T. Ehring, B. Haasdonk

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
The problem of closed-loop control of coupled systems under state constraints is considered. A new method for generating an approximate feedback policy is used in which the gradient of the value function is replaced by a vector-valued kernel surrogate. This is built up from samples from open-loop control problems. Here, additional information about the system originating from the Pontryagin Maximum Principle is exploited. Furthermore, a multi-stage approach and the vectorial kernel orthogonal greedy algorithm are used. With this procedure we can overcome the curse of dimensionality that occurs in the determination of the value function via Hamilton-Jacobi-Bellman equation. Nevertheless, the resulting feedback control is very accurate, robust and real-time capable.
Abstract
The problem of closed-loop control of coupled systems under state constraints is considered. A new method for generating an approximate feedback policy is used in which the [...]
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DATA-DRIVEN REDUCED ORDER MODELING OF ENVIRONMENTAL HYDRODYNAMICS USING DEEP AUTOENCODERS AND NEURAL ODES
S. Dutta, P. Rivera-Casillas, O. Cecil, M. Farthing, E. Perracchione, M. Putti

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
Model reduction for fluid flow simulation continues to be of great interest across a number of scientific and engineering fields. In a previous work [1], we explored the use of Neural Ordinary Differential Equations (NODE) as a non-intrusive method for propagating the latent-space dynamics in reduced order models. Here, we investigate employing deep autoencoders for discovering the reduced basis representation, the dynamics of which are then approximated by NODE. The ability of deep autoencoders to represent the latent-space is compared to the traditional proper orthogonal decomposition (POD) approach, again in conjunction with NODE for capturing the dynamics. Additionally, we compare their behavior with two classical non-intrusive methods based on POD and radial basis function interpolation as well as dynamic mode decomposition. The test problems we consider include incompressible flow around a cylinder as well as a real-world application of shallow water hydrodynamics in an estuarine system. Our findings indicate that deep autoencoders can leverage nonlinear manifold learning to achieve a highly efficient compression of spatial information and define a latentspace that appears to be more suitable for capturing the temporal dynamics through the NODE framework.
Abstract
Model reduction for fluid flow simulation continues to be of great interest across a number of scientific and engineering fields. In a previous work [1], we explored the use [...]
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Fluid flow and strain localisation in partially saturated porous media
M. Zaim, G. Sciarra, P. Kotronis, F. Collin

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
Coupling between fluid fingering and strain localization during the imbibition of a partially saturated soil is investigated in this paper. The fluid mixture saturating the granular skeleton is regarded as a non-uniform fluid characterized via a double well Helmoltz free energy endowed with a gradient regularizing contribution. The porous medium is assumed deformable and the associated elasto-plastic constitutive law is described by the 'Sinfonietta Classica' plastic model. Because of the higher differential order of the hydraulic problem a mixed finite element method is employed.
Abstract
Coupling between fluid fingering and strain localization during the imbibition of a partially saturated soil is investigated in this paper. The fluid mixture saturating the [...]
- 45
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A coupled two-phase model for numerical simulation of a real debris avalanche
S. Moussavi Tayyebi, M. Pastor, M. Stickle, A. Yague, D. Manzanal, M. Molinos, P. Navas

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
Debris flows are characterized as mixtures of solid particles and pore fluids, in which coupling between phases plays a paramount role in the dynamic behaviour. Due to the strong coupling between phases, pore pressures can be generated if the fluidized mass contains solid particles with low permeability. As such, a two-phase propagationconsolidation model should be applied to take into account the motion of each constituent and the time-space evolution of pore-water pressure. In this regard, the capability of a depth-integrated two-phase model, recently developed by the authors, to study the coupled behaviour of solid and fluid in a fluidized geomaterial is evaluated. The developed model is based on the mixture theory in which balance of mass and linear momentum are established for each phase. The computational framework is based on the mesh-free smoothed particle hydrodynamics (SPH), incorporating a 1D finite-difference mesh describing pore pressure's evolution along the vertical distribution of flowing mass. The model is applied to simulate the Johnsons Landing debris avalanche in order to reproduce its complex behaviours, including bifurcation occurred at the mid-channel. The developed two-phase depth-integrated SPH-FD model is also applied to assess the structural countermeasure of the bottom drainage screen, used to reduce the impact of debris flows. The analysis of the results indicates the adequacy of the method to model large deformation of the two-phase materials over an impermeable and permeable bottom boundary. This suggests that the proposed particle-based method is a promising approach for future studies of coupled geophysical problems.
Abstract
Debris flows are characterized as mixtures of solid particles and pore fluids, in which coupling between phases plays a paramount role in the dynamic behaviour. Due to the [...]
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Coupling of numerical models of mesh generation and heat transfer of a tree trunk in a forest fire environment
E. Conceição, J. Gomes, M. Lúcio, J. Raposo, D. Viegas, M. Viegas

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
This work presents a coupling between two numerical models, one for mesh generation and the other for heat transfer analysis, used to characterize the tree trunk thermal behaviour located in a forest fire environment. The geometry of the tree trunk is developed, using adaptive mesh generation, to evaluate the view factors, used to calculate the heat exchanges by radiation, between the virtual trunk tree and a fire front. The fire front represents the existing forest fire. The trunk tree thermal behavior numerical model is based on energy equations. The energy balance integral and differential equations consider the heat exchange by conduction inside the trunk tree, the heat exchange by convection between the trunk tree external surfaces and the environment and the heat exchanges by radiation between the trunk tree external surfaces and the environment and fire front. The numerical simulation is characterized by the propagation of a fire front at a constant fire spread rate of 0.01 m/s from a distance of 5 m upstream of the tree trunk. With an irregular shape, the tree trunk has a height of 2 m and an external diameter of 0.2 m. The fire front has a tilt angle of 45º, 10 m wide and 2 m high. The temperature distribution in the tree trunk was obtained for a wind speed of 0.1 m/s, an average flame temperature of 500ºC, an environmental air temperature of 20ºC and an air relative humidity around the trunk tree of 50%. The temperature distribution obtained allows to identify the areas of the tree trunk tissues that were most affected by the passage of fire.
Abstract
This work presents a coupling between two numerical models, one for mesh generation and the other for heat transfer analysis, used to characterize the tree trunk thermal behaviour [...]
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Studies of Shape Memory Graphene Nanostructures via Integration of Physics-based Modelling and Machine Learning
C. León, R. Melnik

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
In this contribution, we study the properties of new promising graphenebased materials with shape memory effects. While traditional shape memory alloys have been extensively studied, it is a challenge to preserve shape memory properties at the nanoscale. As a result, new materials have been explored, among which graphene oxide (GO) crystals with ordered epoxy groups where a recoverable strain of 14.5% has already been reported. We use such nanoscale GO structures as a benchmark example for our studies here. MBTR and SOAP representations are employed in a general-purpose ML model to analyze the effect of long-range interactions in GO. Finally, a physics-based ML model allows us to build interatomic potentials for 2D and 1D systems. The model predicts quantum mechanical effects due to the electronic confinement in narrow nanoribbons and shows the evolution of the local minimal energies associated with two-phase states.
Abstract
In this contribution, we study the properties of new promising graphenebased materials with shape memory effects. While traditional shape memory alloys have been extensively [...]
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Thermoelastic Analysis of Enhanced Geothermal Systems Using a Fully Coupled Thermo-Hydro-Mechanical Model
M. Aliyu

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
In analysing energy extraction from enhanced geothermal systems (EGS), the thermoelastic effect on characteristic reservoir conditions must be considered. During heat extraction, thermal contraction is induced by cold fluid injection. As a result, thermoelastic deformation is triggered. The induced thermoelasticity could alter the rock's properties, such as fracture aperture and permeability, making the thermoelastic effect crucial in understanding EGS reservoir behaviour. Based on coupled thermo-hydro-mechanical (THM) processes extended to include the thermoelastic effect, this paper presents a three-dimensional (3D) numerical model of an EGS reservoir with multiple fractures. The fracture network system is the primary flow path because the surrounding rock matrix is considered impermeable [6]. The behaviour of the reservoir is studied using different flow boundary conditions. An in-depth analysis is performed to determine the rate at which the thermoelastic effect develops during heat extraction. An application of the analysis is made to investigate a reservoir's characterisation in a different range of scenarios. The results presented have shown the limitations imposed by the thermoelastic effect on the long-term performance of EGS reservoirs.
Abstract
In analysing energy extraction from enhanced geothermal systems (EGS), the thermoelastic effect on characteristic reservoir conditions must be considered. During heat extraction, [...]
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Combining Coupled Skorokhod SDE and Lattice Gas Frameworks for Multi-fidelity Modelling of Complex Behavioral Systems
T. Thieu, R. Melnik

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
To model reliably behavioral systems with complex bio-social interactions, accounting for uncertainty quantification, is critical for many application areas. However, in terms of the mathematical formulation of the corresponding problems, one of the major challenges is coming from the fact that corresponding stochastic processes should, in most cases, be considered in bounded domains, possibly with obstacles. This has been known for a long time and yet, very little has been done for the quantification of uncertainties in modelling complex behavioral systems described by such stochastic processes. In this paper, we address this challenge by considering a coupled system of Skorokhodtype stochastic differential equations (SDEs) describing interactions between active and passive participants of a mixed-population group. In developing a multi-fidelity modelling methodology for such behavioral systems, we combine lowand high-fidelity results obtained from (a) the solution of the underlying coupled system of SDEs and (b) simulations with a statistical-mechanics-based lattice gas model, where we employ a kinetic Monte Carlo procedure. Furthermore, we provide representative numerical examples of healthcare systems, subject to an epidemic, where the main focus in our considerations is given to an interacting particle system of asymptomatic and susceptible populations.
Abstract
To model reliably behavioral systems with complex bio-social interactions, accounting for uncertainty quantification, is critical for many application areas. However, in terms [...]
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A deterministic approach for shape and topology optimisation under material uncertainty in additive manufacturing
C. Mang, L. Zoghaib, J. Cortial, C. Nardoni, D. Danan, F. Bordeu

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
The present work aims at handling uncertain materials in shape and topology optimisation applied to additive manufacturing. More specifically, we minimise an objective function combining the mean values of standard cost functions and assume that the uncertainties are small and generated by two random variables. These two variables representing the amplitude of the Young's modulus correspond to the zone of porosity inclusion and surface roughness defects. A deterministic approach that relies on a secondorder Taylor expansion of the cost function has been proposed by Allaire & Dapogny [2]. The present work proposes a general framework to handle uncertainties of the Young's modulus in which its amplitude is divided into N zones and then applied onto two zones corresponding to the porosity inclusion and surface roughness defects. We demonstrate the effectiveness of the approach in the context of the level-set-based topology optimisation for the robust compliance minimisation of three-dimensional cantilever test cases.
Abstract
The present work aims at handling uncertain materials in shape and topology optimisation applied to additive manufacturing. More specifically, we minimise an objective function [...]
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Forced vibration of the aluminum beam using a piezoelectric actuator - experiment and finite element analysis.
V. Goga, V. Kutiš, Š. Berta, G. Gálik, J. Murin, J. Paulech

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
This paper deals with the forced vibration of the aluminum beam using a piezoelectric actuator. Cantilever beam was excited by thin piezoelectric film placed near the fix support. The oscillation of the free end of the beam was measured using a laser displacement sensor. The beam's eigenfrequency and damping ratio for the first bending vibration mode was determined experimentally. The beam's deflection when the beam was excited by a piezoelectric actuator was also determined experimentally. The actuator was controlled by a signal generator and high-performance power supply and linear amplifier module for driving piezoelectric actuators. Data from experimental measurements were used to validate the finite element model of the beam with piezoelectric actuator. Results from experimental measurements and numerical simulations were compared.
Abstract
This paper deals with the forced vibration of the aluminum beam using a piezoelectric actuator. Cantilever beam was excited by thin piezoelectric film placed near the fix [...]
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Accelerating the FlowSimulator: Profiling and scalability analysis of an industrial-grade CFD-CSM toolchain
I. Huismann, L. Reimer, S. Strobl, J. Eichstädt, R. Tschüter, A. Rempke, G. Einarsson

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
Aeroelasticity simulations increase in importance for aircraft design, requiring an efficient coupling of computational fluid dynamics (CFD) with computational structure mechanics (CSM) solvers. This contribution investigates the scalability of a high-fidelity CFD-CSM toolchain on modern high-performance computing (HPC) architectures. It consists of DLR's TAU solver for fluid dynamics simulations [1], and FlowSimulator [2] components for the incorporation of precomputed structural normal mode data, as well as for the underlying mesh deformations. The computational performance of the entire simulation pipeline is evaluated using a single measurement suite, allowing to identify bottlenecks of individual components and differences in their scalability. Preliminary improvements are realized via hybrid parallelization. Although this study focuses on a specific toolchain, key findings about scalability issues are relevant for complex CFD-CSM or other coupled simulations in general.
Abstract
Aeroelasticity simulations increase in importance for aircraft design, requiring an efficient coupling of computational fluid dynamics (CFD) with computational structure mechanics [...]
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Nuclear Reactor Pressure Thermal Shock Simulation
G. Galik, V. Kutis, J. Paulech, V. Goga

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
The article describes a multistage modelling methodology proposed by the author for the modelling of emergency core cooling processes. The methodology is based on the best practice guidelines presented by the IAEA, it is applied to a specific scenario of emergency core cooling during a loss of coolant accident [1] with an effective break diameter of 20mm. A 3D thermohydraulic analysis was performed as the first step in the solution process, where the transient changes in the pressure, velocity and temperature fields within the reactor pressure vessel were studied [2]. The primary knowledge learned when processing the results of the first step, was the presence of an oscillating cold coolant stripe in close proximity to the pressure vessel wall. The next step in the methodology consisted of a threedimensional thermo-mechanical analysis of the reactor pressure vessel [3]. In this step, pressure thermal shock induced critical zones of mechanical loading were identified and the influence of the oscillatory character of the cold stripe on the pressure vessel was studied.
Abstract
The article describes a multistage modelling methodology proposed by the author for the modelling of emergency core cooling processes. The methodology is based on the best [...]
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Nonlocal Multiscale Interactions in Brain Neurodegenerative Protein Dynamics and Coupled Proteopathic Processes
S. Pal, R. Melnik

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
We take a heterodimer multiscale reaction-diffusion model as a starting point and modify it to account for the nonlocality of the underlying processes. The resulting model is a coupled system of integro-differential equations. The effect of nonlocal interactions is quantified based on the comparisons of the newly developed model with its local counterpart. Our primary focus is given to the estimation of conversion times from healthy to toxic proteins. This is done based on the stability analysis of a simplified model, as well as on the fully coupled numerical implementation. Several clinically relevant patient proteopathies are highlighted. They include the primary tauopathy, as well as the secondary tauopathy where the sustained presence of toxic tau protein requires also to be accompanied by toxic amyloid-beta peptides. We demonstrate the dynamics of concentrations of toxic proteins under several clinically realistic scenarios. Finally, we carry out a detailed parametric study, providing further insight into the role of nonlinear effects controlled via the Holling type II functional response.
Abstract
We take a heterodimer multiscale reaction-diffusion model as a starting point and modify it to account for the nonlocality of the underlying processes. The resulting model [...]
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A Staggered Coupling Scheme of the Material Point Method and the Finite Element Method using Gauss Seidel Communication Pattern
V. Singer, B. Chandra, R. Wüchner, A. Larese

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
The goal of the present work is the simulation mass movement hazards, involving fast and large soil deformation, interacting with flexible protection structures. For the simulation of those large deformation phenomena, involving complex history dependent material laws, the Material Point Method (MPM) is a powerful method, as the particles move trough a fixed background mesh. This allows to overcome the classical limitation of the Finite Element Method (FEM) related to mesh distortion in large strain problems. Therefore, a staggered or partitioned coupling scheme is proposed, combining the advantages of FEM and MPM by solving both models separately using their respective established environment, whereas the communication between the two fields is achieved by mapping boundary conditions on the shared interface. In this work a Gauss-Seidel communication pattern is considered, leading to the necessity of imposing Dirichlet Boundary Conditions on one interface (in this study: FEM) and Neumann Boundary Conditions on the corresponding counterpart (in this study: MPM). For validation purposes, a structural example with analytical solution is chosen.
Abstract
The goal of the present work is the simulation mass movement hazards, involving fast and large soil deformation, interacting with flexible protection structures. For the simulation [...]
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Electro-thermo-mechanical analysis of actuator structure made of functionally graded material.
J. Paulech, V. Kutiš, J. Murín, G. Gálik, V. Goga

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
The paper deals with a new approach in analyzing of the actuator systems made of Functionally Graded Materials (FGM) using our new beam finite elements. Weak coupled electro-thermomechanical analysis and spatial continuous variation of material properties are considered for chosen actuator structure. This electrically driven actuator is simple-shaped due to properly chosen variation of material properties to ensure functionality of the actuator at material and physical level instead of the geometric shape level. The solution results will be compared with those obtained by using solid elements of a FEM commercial program.
Abstract
The paper deals with a new approach in analyzing of the actuator systems made of Functionally Graded Materials (FGM) using our new beam finite elements. Weak coupled electro-thermomechanical [...]
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PIEZOELECTRIC BEAM FINITE ELEMENT MODEL AND ITS REDUCTION TO STATE-SPACE MODEL
V. Kutis, J. Paulech, G. Galik, J. Murin, V. Goga

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
The paper deals with modeling and simulation of the connection of piezoelectric materials, FGM materials and LQR control, using state-space model, which is built by modal truncation MOR method. FEM equations of piezoelectric finite beam were implemented in FEM program MultiFEM written in Wolfram Language. Modal truncation MOR method, which uses results from modal analysis, is also implemented in program Wolfram Mathematica. Simple piezoelectric structure is analyzed in numerical experiments, where FEM results are compared with MOR results.
Abstract
The paper deals with modeling and simulation of the connection of piezoelectric materials, FGM materials and LQR control, using state-space model, which is built by modal [...]
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Topology Optimization for Thermoelastic Metamaterials
M. Van Den Ouden

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
The concept of thermoelastic metamaterials has been around for over two decades. Nevertheless they are rarely applied, due to their poor manufacturability. To enhance their applicability, a topology optimization framework is proposed and verified, able to generate finite thermoelastic unit cell arrays with tailored unidirectional thermal expansion, manufacturable through automated multi-material additive manufacturing methods. A thermoelastic unit cell array is optimized for near zero thermal expansion. A sample has been fabricated using a low-tech production process, inspired by a multi-material ultrasonic additive manufacturing process, with a unidirectional thermal expansion of (-4±8) μm=(m°C). With this sample, the numerical predictions have been validated experimentally, confirming the capability of the proposed design approach to generate performant and realizable thermoelastic metamaterials.
Abstract
The concept of thermoelastic metamaterials has been around for over two decades. Nevertheless they are rarely applied, due to their poor manufacturability. To enhance their [...]
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A Deep Learning Approach for Curvature Prediction in Algebraic Volume of Fluid Methods
Z. Kraus, F. Köhler, J. Friedrich, M. Schäfer

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
The accurate prediction of the curvature of fluid-fluid interfaces is crucial for appropriately modeling the surface forces when computing two-phase flows with immiscible fluids. The volume of fluid (VOF) method is often used for these computations to specify the different fluids and the interface by the so-called volume fraction field. In this study, a deep artificial neural network is trained to predict the interface curvature from the volume fraction values. This approach is investigated within an algebraic VOF framework. A rudimentary interface resharpening algorithm is introduced for the input stencils to enhance the accuracy and robustness when the interface can not be captured entirely sharp. The performance of different neural network architectures is evaluated by generic test data and the computation of two oscillating droplet flow configurations.
Abstract
The accurate prediction of the curvature of fluid-fluid interfaces is crucial for appropriately modeling the surface forces when computing two-phase flows with immiscible [...]
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On the Stability of a Steady Convective Flow in a Vertical Layer of a Chemically Reacting Fluid
A. Gritsans, V. Koliskina, A. Kolyshkin, F. Sadyrbaev

9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2021).

Abstract
Linear stability of a steady flow of a chemically reacting fluid located in a vertical fluid layer bounded by two infinite parallel planes is investigated. Steady convective flow in the vertical direction is initiated due to the combined effect of internal heat generation and the temperature difference between the planes. Imposing small perturbations on the base flow, linearizing equations of thermal convection under the Boussinesq approximation in the neighbourhood of the base flow and using the method of normal modes we obtain an eigenvalue problem for a system of ordinary differential equations. Collocation method is used to discretize the problem. Numerical calculations are performed in Matlab. Fluid velocity, pressure, and temperature are the solutions of a nonlinear boundary value problem. Properties of the nonlinear boundary value problem for the base flow are investigated numerically using bifurcation analysis. It is shown that both the temperature difference between the planes and intensity of internal heat generation have a destabilizing influence on the base flow. The intensity of heat transfer in the direction perpendicular to the main flow can promote instability and leads to more intensive mixing. This fact can be used in design of bioreactors for biomass thermal conversion.
Abstract
Linear stability of a steady flow of a chemically reacting fluid located in a vertical fluid layer bounded by two infinite parallel planes is investigated. Steady convective [...]
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