An implementation of the soft-sphere discrete element method in a high-performance parallel gravity tree-code

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• 作者：Stephen R. Schwartz (12) srs@astro.umd.edu
  Derek C. Richardson (1)
  Patrick Michel (2)
• 关键词：Bulk solids – ; Solar system – ; DEM – ; Hopper – ; SSDEM
• 刊名：Granular Matter
• 出版年：2012
• 出版时间：May 2012
• 年：2012
• 卷：14
• 期：3
• 页码：363-380
• 全文大小：621.5 KB
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• 作者单位：1. Department of Astronomy, University of Maryland, College Park, MD 20742-2421, USA2. Lagrange Laboratory, University of Nice Sophia Antipolis, CNRS, C么te d鈥橝zur Observatory, Observatoire de la C么te d鈥橝zur, B.P. 4229, 06304 Nice Cedex 4, France
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Granular Media
  Industrial Chemistry and Chemical Engineering
  Engineering Fluid Dynamics
  Structural Foundations and Hydraulic Engineering
  Engineering Thermodynamics and Transport Phenomena
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-7636

文摘

We present our implementation of the soft-sphere discrete element method (SSDEM) in the parallel gravitational N-body code pkdgrav, a well-tested simulation package that has been used to provide many successful results in the field of planetary science. The implementation of SSDEM allows for the modeling of the different contact forces between particles in granular material, such as various kinds of friction, including rolling and twisting friction, and the normal and tangential deformation of colliding particles. Such modeling is particularly important in regimes for which collisions cannot be treated as instantaneous or as occurring at a single point of contact on the particles’ surfaces, as is done in the hard-sphere discrete element method already implemented in the code. We check the validity of our soft-sphere model by reproducing successfully the dynamics of flows in a cylindrical hopper. Other tests will be performed in the future for different dynamical contexts, including the presence of external and self-gravity, as our code also includes interparticle gravitational force computations. This will then allow us to apply our tool with confidence to planetary science studies, such as those aimed at understanding the dynamics of regolith on solid celestial body surfaces, or at designing efficient sampling tools for sample-return space missions.