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| + | ==Abstract== | ||
| + | Numerical simulations of granular flows based on the Distinct Element Method (DEM) commonly use spherical particles for ease of contact mechanics calculations and for having fast contact searching algorithms. However, for irregularly shaped particles, rotation is not only affected by friction but also by mechanical interlocking (Cleary, 2010). Only tangential forces lead to the rotation of spherical particles, whereas for irregularly shaped particles, rotation can be as a result of both normal and tangential contact forces (Favier et al., 2001). Mechanical interlocking of irrregularly shaped particles can be simulated in DEM by (i) limiting the rolling friction of spherical particles (Morgan, 2004), (ii) using overlapping spheres (Favier et al., 2001), (iii) using polyhydra (Potapov and Campbell, 1997). The first two method have been critically evaluated for the flow of corn seeds and spray-dried powders. A comparison is made of the estimated solid fraction and the tangential and radial velocity distributions of the particles from DEM and those measured experimentally. The shapes of the corn seeds and spray-dried powders have been captured using X-Ray micro tomography, and ASG2013 software has been used to generate the coordinates of the overlapping spheres. It is shown that the approximation of particle shape is only critical for dense shearing flows. The use of polyhydra enables particle fracture to be simulated more realistically, but necessitates implementation of fracture mechanics to be predictive. In this paper the results of our evaluations are reported. | ||
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| + | == Recording of the presentation == | ||
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| − | | {{#evt:service=youtube|id=https://youtu.be/6I1kH1qkl0w alignment=center}} | + | | {{#evt:service=youtube|id=https://youtu.be/6I1kH1qkl0w | alignment=center}} |
|- style="text-align: center;" | |- style="text-align: center;" | ||
| Location: Technical University of Catalonia (UPC), Vertex Building. | | Location: Technical University of Catalonia (UPC), Vertex Building. | ||
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| Date: 28 - 30 September 2015, Barcelona, Spain. | | Date: 28 - 30 September 2015, Barcelona, Spain. | ||
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== General Information == | == General Information == | ||
* Location: Technical University of Catalonia (UPC), Barcelona, Spain. | * Location: Technical University of Catalonia (UPC), Barcelona, Spain. | ||
* Date: 28 - 30 September 2015 | * Date: 28 - 30 September 2015 | ||
| − | * Secretariat: [//www.cimne.com/ CIMNE] | + | * Secretariat: [//www.cimne.com/ International Center for Numerical Methods in Engineering (CIMNE)]. |
== External Links == | == External Links == | ||
* [//congress.cimne.com/particles2015/frontal/default.asp Particles 2015] Official Website of the Conference. | * [//congress.cimne.com/particles2015/frontal/default.asp Particles 2015] Official Website of the Conference. | ||
* [//www.cimnemultimediachannel.com/ CIMNE Multimedia Channel] | * [//www.cimnemultimediachannel.com/ CIMNE Multimedia Channel] | ||
| + | |||
| + | ==References== | ||
| + | <div id="1"></div> | ||
| + | [[#cite-1|[1]]] P. W. Cleary, Particuology 8, 106–118 (2010). | ||
| + | <div id="2"></div> | ||
| + | [[#cite-2|[2]]] J. F. Favier, M. H. Abbaspour-Fard, and M. Kremmer, Journal of Engineering Mechanics | ||
| + | 127, 971–977 (2001). | ||
| + | <div id="3"></div> | ||
| + | [[#cite-3|[3]]] J. K. Morgan, Pure and Applied Geophysics 161, 1877–1891 (2004) | ||
| + | <div id="4"></div> | ||
| + | [[#cite-4|[4]]] A.V. Potapov, C.S. Campbell, CS, Powder Technology, 94, 109-122 (1997) | ||
Latest revision as of 11:33, 20 July 2016
Abstract
Numerical simulations of granular flows based on the Distinct Element Method (DEM) commonly use spherical particles for ease of contact mechanics calculations and for having fast contact searching algorithms. However, for irregularly shaped particles, rotation is not only affected by friction but also by mechanical interlocking (Cleary, 2010). Only tangential forces lead to the rotation of spherical particles, whereas for irregularly shaped particles, rotation can be as a result of both normal and tangential contact forces (Favier et al., 2001). Mechanical interlocking of irrregularly shaped particles can be simulated in DEM by (i) limiting the rolling friction of spherical particles (Morgan, 2004), (ii) using overlapping spheres (Favier et al., 2001), (iii) using polyhydra (Potapov and Campbell, 1997). The first two method have been critically evaluated for the flow of corn seeds and spray-dried powders. A comparison is made of the estimated solid fraction and the tangential and radial velocity distributions of the particles from DEM and those measured experimentally. The shapes of the corn seeds and spray-dried powders have been captured using X-Ray micro tomography, and ASG2013 software has been used to generate the coordinates of the overlapping spheres. It is shown that the approximation of particle shape is only critical for dense shearing flows. The use of polyhydra enables particle fracture to be simulated more realistically, but necessitates implementation of fracture mechanics to be predictive. In this paper the results of our evaluations are reported.
Recording of the presentation
| Location: Technical University of Catalonia (UPC), Vertex Building. |
| Date: 28 - 30 September 2015, Barcelona, Spain. |
General Information
- Location: Technical University of Catalonia (UPC), Barcelona, Spain.
- Date: 28 - 30 September 2015
- Secretariat: International Center for Numerical Methods in Engineering (CIMNE).
External Links
- Particles 2015 Official Website of the Conference.
- CIMNE Multimedia Channel
References
[1] P. W. Cleary, Particuology 8, 106–118 (2010).
[2] J. F. Favier, M. H. Abbaspour-Fard, and M. Kremmer, Journal of Engineering Mechanics 127, 971–977 (2001).
[3] J. K. Morgan, Pure and Applied Geophysics 161, 1877–1891 (2004)
[4] A.V. Potapov, C.S. Campbell, CS, Powder Technology, 94, 109-122 (1997)
Document information
Published on 29/06/16
Licence: CC BY-NC-SA license
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