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Precision and computational costs of Level Set-Discrete Element Method (LS-DEM) with respect to DEM

Abstract : The Level Set-Discrete Element Method (LS-DEM) extends DEM towards arbitrary grain shapes by storing distance-to-surface values on a grid for each Discrete Element (DE), together with considering boundary nodes located onto the DE's surface. Both these ingredients are shown to affect the precision and computational costs of LS-DEM, considering various numerical simulations at the contact-and packing-scales for ideal spherical and superellipsoid shapes. In the case of a triaxial compression for spherical particles, approaching with a reasonable precision the reference result obtained in classical DEM requires the grid spacing to be smaller than one tenth of particle size, as well as using a couple thousands of boundary nodes. Computational costs in terms of memory (RAM) or evaluation time then increase in LS-DEM by two or three orders of magnitude. Simple OpenMP parallel simulations nevertheless significantly reduce the increase in time cost, possibly dividing the latter by 20.
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https://hal.inrae.fr/hal-03225311
Contributor : Jérôme Duriez <>
Submitted on : Wednesday, May 12, 2021 - 1:40:40 PM
Last modification on : Friday, June 18, 2021 - 10:14:02 AM

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Jérôme Duriez, Stéphane Bonelli. Precision and computational costs of Level Set-Discrete Element Method (LS-DEM) with respect to DEM. Computers and Geotechnics, Elsevier, 2021, 134, pp.104033. ⟨10.1016/j.compgeo.2021.104033⟩. ⟨hal-03225311⟩

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