Evaluation of contact force models for discrete modelling of ellipsoidal particles

Kildashti, K; Dong, K; Samali, B; Zheng, Q; Yu, A

Evaluation of contact force models for discrete modelling of ellipsoidal particles

Kildashti, K Dong, K Samali, B

Zheng, Q Yu, A

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Publication Type:: Journal Article
Citation:: Chemical Engineering Science, 2018, 177 pp. 1 - 17
Issue Date:: 2018-02-23

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Field	Value	Language
dc.contributor.author	Kildashti, K	en_US
dc.contributor.author	Dong, K	en_US
dc.contributor.author	Samali, B https://orcid.org/0000-0002-3426-7745	en_US
dc.contributor.author	Zheng, Q	en_US
dc.contributor.author	Yu, A	en_US
dc.date.issued	2018-02-23	en_US
dc.identifier.citation	Chemical Engineering Science, 2018, 177 pp. 1 - 17	en_US
dc.identifier.issn	0009-2509	en_US
dc.identifier.uri	http://hdl.handle.net/10453/131811
dc.description.abstract	© 2017 Elsevier Ltd Discrete element method (DEM) has been widely used to study granular materials. However, how to model non-spherical particles is still challenging. Ellipsoidal particles are a typical kind of non-spherical particles in DEM simulations. There are three common methods to calculate the overlap and contact force between two ellipsoidal particles, namely, geometric potential (GP), common normal (CN) and overlap region (OR) methods. These methods are based on different physical concepts and hence will give different results. However, the comprehensive evaluation of these methods is still lacking, leaving DEM users no solid reference for selecting algorithms. In this paper, we conduct detailed comparisons on the penetration depth, contact plane and contact point predicted by the three methods. Particularly, using the orientation discretization method, the results are compared in all orientations quantitatively. It is shown that the difference between GP and CN is the largest whereas OR is always in between. The difference in contact point is relatively small when overlap ratio is small, whereas the difference in contact plane can always be large. Further, the results are directly compared to those obtained from sub-particle scale finite element analyses, which reveals that CN can always accurately predict contact plane and most times contact point, while GP are relatively better in predicting force magnitude. This study not only gives a more clear and comprehensive evaluation of different contact force models for ellipsoidal particles but also establishes an effective framework for comparing and verifying contact force models for general non-spherical particles.	en_US
dc.relation.ispartof	Chemical Engineering Science	en_US
dc.relation.isbasedon	10.1016/j.ces.2017.11.004	en_US
dc.subject.classification	Chemical Engineering	en_US
dc.title	Evaluation of contact force models for discrete modelling of ellipsoidal particles	en_US
dc.type	Journal Article
utslib.citation.volume	177	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	0904 Chemical Engineering	en_US
utslib.for	0913 Mechanical Engineering	en_US
utslib.for	0914 Resources Engineering and Extractive Metallurgy	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	177	en_US

Abstract:

© 2017 Elsevier Ltd Discrete element method (DEM) has been widely used to study granular materials. However, how to model non-spherical particles is still challenging. Ellipsoidal particles are a typical kind of non-spherical particles in DEM simulations. There are three common methods to calculate the overlap and contact force between two ellipsoidal particles, namely, geometric potential (GP), common normal (CN) and overlap region (OR) methods. These methods are based on different physical concepts and hence will give different results. However, the comprehensive evaluation of these methods is still lacking, leaving DEM users no solid reference for selecting algorithms. In this paper, we conduct detailed comparisons on the penetration depth, contact plane and contact point predicted by the three methods. Particularly, using the orientation discretization method, the results are compared in all orientations quantitatively. It is shown that the difference between GP and CN is the largest whereas OR is always in between. The difference in contact point is relatively small when overlap ratio is small, whereas the difference in contact plane can always be large. Further, the results are directly compared to those obtained from sub-particle scale finite element analyses, which reveals that CN can always accurately predict contact plane and most times contact point, while GP are relatively better in predicting force magnitude. This study not only gives a more clear and comprehensive evaluation of different contact force models for ellipsoidal particles but also establishes an effective framework for comparing and verifying contact force models for general non-spherical particles.

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http://hdl.handle.net/10453/131811