Results for "Offshore" : Scipedia

Collection of closed articles in transport research

Challenges in Slug Modeling and Control for Offshore Oil and Gas Productions:A Review Study

Abstract

The upstream offshore multi-phase well-pipeline-riser installations are facing huge challenges related to slugging flow: An unstable flow regime where the flow rates, pressures and temperatures oscillate in the multi-phase pipelines. One typical severe slug is induced by vertical [...]

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Revista de Materiales Compuestos

Monitoring of multi-material structures for offshore applications with fiber optic sensors

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The development of renewable energies is a fundamental need to meet the ambitious energy targets demanded by industry and the European Union in the coming years. In the case of offshore wind energy, it has certain limitations due to its relative youth and associated costs, especially [...]

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Revista de Materiales Compuestos

Vol4 num2-20 Monitoring of multi-material structures for offshore applications with fiber optic sensors

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10th Conference on Computational Methods in Marine Engineering (Marine 2023)

An IGA-BEM solver for fully nonlinear wave kinematics and associated loads on offshore wind turbine towers

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Julio García-Espinosa's papers in WoS journals

A Digital Twin for Assessing the Remaining Useful Life of Offshore Wind Turbine Structures

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This paper delves into the application of digital twin monitoring techniques for enhancing offshore floating wind turbine performance, with a detailed case study that uses open-source digital twin software. We explore the practical implementation of digital twins and their efficacy [...]

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VIII International Conference on Particle-Based Methods (PARTICLES 2023)

Numerical Investigation of the Installation of Suction Caisson in Sand Using Material Point Method

Abstract

Suction caisson has gained interest in recent years as an alternative foundation for offshore wind turbines due to its cost-effectiveness and easy installation compared to conventional foundations such as monopile. After initial penetration due to its self-weight, suction is applied until the caisson reaches the desired depth. Applying suction provides additional driving force due to the pressure difference between inside and outside the caisson and induces seepage that degrades friction and tip resistance, which further facilitates the installation. The seepage plays a vital role in installing suction caisson in sand; however, it might change the soil state which affects the ultimate bearing capacity of the caisson. Several research works have been conducted to study the suction caisson installation in sand. However, the complexities of the problem including large deformation, solid-fluid and soil-structure interaction, inhibited these studies from fully understanding the installation mechanism. This paper proposes a large deformation modeling framework by using the material point method (MPM). MPM is a hybrid Lagrangian-Eulerian particle-based method that uses material points over a fixed computational mesh where governing equations are solved. During the convection of the particles, the background mesh is kept fixed, making it suitable for large deformation problems. The model considers soil-structure interaction by adopting a Coulomb contact algorithm between the caisson and surrounding soil. In this paper, the stability of the contact algorithm is ensured by correcting material point velocities in the vicinity of the caisson interface using a limiting velocity based on the element size and time step. The framework is validated by comparing a simulation of caisson installation under constant velocity with results published in the literature. Our proposed framework’s results agree with previous published results, demonstrating that the simplified stabilization procedure does not affect the simulation results. This is a promising result that will enable the incorporation of fully coupled analysis to better understand the effects of induced seepage on the installation mechanism of suction caissons.

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7th International Conference on Geotechnical and Geophysical Site Characterization

Cyclic Cone Penetrometer Tests: Worthwhile?

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This paper explores the merit of including cyclic episodes in cone penetrometer tests to measure changes in sleeve resistance during cycling. Tests were carried out in a geotechnical centrifuge in a kaolin clay and a dense silica sand. The data from the tests in clay indicate that [...]

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7th International Conference on Geotechnical and Geophysical Site Characterization

Deformability Parameters in the Offshore In-Situ-Test Survey for the New Breakwater Project in Genova Italy

Abstract

The harbour of Genova is currently protected by a breakwater barrier that is 4 km long. One of the ongoing PNRR projects in Italy consists in dismissing the current breakwater and rebuilding it farther away from shore. The new breakwater will extend to a length of over 6.2 km and [...]

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7th International Conference on Geotechnical and Geophysical Site Characterization

Offshore rock investigations by a remotely operated submersible drilling rig with continuous drilling recording

Abstract

The submersible drilling rig presented in this paper was designed and constructed with the aim to allow conducting soil or rock characterization in offshore investigations in shallow water projects when short target penetrations are required. The system is instrumented with sensing [...]

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7th International Conference on Geotechnical and Geophysical Site Characterization

A case study addressing the development of a novel marine seismic cone penetration testing system.

Abstract

Within the offshore wind sector, following the conclusions of the Pile Soil Analysis (PISA) Project increased emphasis has been placed on the acquisition of in-situ ðºðºðððððð data, to corroborate laboratory-based measurements, to allow for foundation weight optimization. This requirement for higher fidelity data at all wind turbine locations is coupled with the increased requirement to acquire data in shorter periods to meet ambitious development schedules for offshore wind farms. The development of a deep push seabed SCPT which can be deployed fully autonomously is considered to address this challenge facing the offshore wind industry. Recognising that within the current standards there is a shortfall on what is considered as accurate and reliable data with regards to having confidence in the shear wave velocity (ð£ð£ð ð ) measurements obtained offshore, there is a requirement for discussion within the industry; clients, designers and contractors, on how to provide improved set-ups, acquisition and interpretation methods in order to increase the confidence in the ð£ð£ð ð data acquired. The case study described within this paper, initiated by such dialog, presents the specification, construction, testing and utilisation of a dual array non-drilling mode seismic cone penetration test (SCPT) device and seismic source to provide demonstrable reliability and accuracy in acquisition and interpretation of in-situ ð£ð£ð ð measurements. Within this context, the paper describes; the engineering considerations and optimisation of a novel device intended for deployment from a new generation of robotic vessel; application and limitations of the set-up during trials and offshore operations; commentary on the in-situ data including challenges encountered during interpretation and comparison with existing data acquired at the same location, established correlations and site-specific correlations.

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