4.4 Article

Multisphere Representation of Convex Polyhedral Particles for DEM Simulation

期刊

ADVANCES IN CIVIL ENGINEERING
卷 2021, 期 -, 页码 -

出版社

HINDAWI LTD
DOI: 10.1155/2021/8846004

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资金

  1. Open Fund of State Key Laboratory of Hydraulics and Mountain River Engineering (Sichuan University) [SKHL1725]
  2. Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (China Institute of Water Resources and Hydropower Research) [IWHR-SKL-KF202016]
  3. Natural Science Foundation of Hunan Province (CN) [2020JJ5732]
  4. National Key R&D Program of China [2017YFC1501100]

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A novel algorithm has been developed to accurately represent complex-shaped particles for DEM modeling. The algorithm involves placing spheres in three steps to form a clump, determining the mass properties of the clump based on the corresponding polyhedral particle, and validating the algorithm's performance through an example.
The representation of particles of complex shapes is one of the key challenges of numerical simulations based on the discrete element method (DEM). A novel algorithm has been developed by the authors to accurately represent 2D arbitrary particles for DEM modelling. In this paper, the algorithm is extended from 2D to 3D to model convex polyhedral particles based on multisphere methods, which includes three steps: the placement of spheres at the corners, along the edges, and on the facets in sequence. To give a good representation of a polyhedral particle, the spheres are placed tangent to the particle surface in each step. All spheres placed in the three steps are clumped together into a clump in DEM. In addition, the mass properties of the clump are determined based on the corresponding polyhedral particle to obtain accurate simulation results. Finally, an example is used to validate the robust and automatic performance of the algorithm in generating a sphere clump model for an assembly of polyhedral particles. A current FORTRAN version of the algorithm is available by contacting the authors.

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