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| Level set contact algorithm for DEM simulations of concave polyhedron elements |
| Received:February 10, 2022 Revised:April 28, 2022 |
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| DOI：10.7511/jslxCMGM202204 |
| KeyWord:discrete element method concave polyhedron multiple contact points level set method |
| Author | Institution |
| 王嗣强 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
| 薛一桢 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
| Michael Zhuravkov |
白俄罗斯国立大学 理论与应用力学系, 白俄罗斯明斯克 ;大连理工大学 大连理工大学白俄罗斯国立大学联合学院, 大连 |
| 季顺迎 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 ;大连理工大学 大连理工大学白俄罗斯国立大学联合学院, 大连 |
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| Abstract: |
| The polyhedral model can theoretically be used to construct arbitrarily shaped particles in the discrete element method (DEM).Due to the limitations of the DEM contact algorithm,the polyhedral model is only used to simulate the dynamic properties of particles with convex morphology.For polyhedral elements with concave surfaces,the contact algorithm for individual contact points can not accurately calculate the forces between elements.To accurately calculate single or multiple contact points between polyhedral particles,a level-set contact algorithm is developed for convex and concave polyhedral elements.In this method,the spatial level-set function and zero level-set function of the polyhedral element are established by the point-triangle element distance calculation method and the odd-even judgment method,and single or multiple contact points between polyhedral elements are obtained by solving the two level-set functions.To examine the reliability of the level-set contact algorithm,the packing and collapse processes of spherical and concave polyhedral granular materials are simulated using the DEM.Meanwhile,the effects of particles shapes on the volume fraction and angle of repose are analyzed. |
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