Fast spot-based multiscale simulations of granular drainage

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We develop a multiscale simulation method for dense granular drainage, based on the recently proposed spot model, where the particle packing flows by local collective displacements in response to diffusing"spots'" of interstitial free volume. By comparing with discrete-element method (DEM) simulations of 55,000 spheres in a rectangular silo, we show that the spot simulation is able to approximately capture many features of drainage, such as packing statistics, particle mixing, and flow profiles. The spot simulation runs two to three orders of magnitude faster than DEM, making it an appropriate method for real-time control or optimization. We demonstrateextensions for modeling particle ... continued below

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Rycroft, Chris H.; Wong, Yee Lok & Bazant, Martin Z. May 22, 2009.

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We develop a multiscale simulation method for dense granular drainage, based on the recently proposed spot model, where the particle packing flows by local collective displacements in response to diffusing"spots'" of interstitial free volume. By comparing with discrete-element method (DEM) simulations of 55,000 spheres in a rectangular silo, we show that the spot simulation is able to approximately capture many features of drainage, such as packing statistics, particle mixing, and flow profiles. The spot simulation runs two to three orders of magnitude faster than DEM, making it an appropriate method for real-time control or optimization. We demonstrateextensions for modeling particle heaping and avalanching at the free surface, and for simulating the boundary layers of slower flow near walls. We show that the spot simulations are robust and flexible, by demonstrating that they can be used in both event-driven and fixed timestep approaches, and showing that the elastic relaxation step used in the model can be applied much less frequently and still create good results.

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  • Journal Name: Powder Technology

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  • Report No.: LBNL-1937E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 960385
  • Archival Resource Key: ark:/67531/metadc933180

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  • May 22, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 18, 2016, 2:37 p.m.

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Rycroft, Chris H.; Wong, Yee Lok & Bazant, Martin Z. Fast spot-based multiscale simulations of granular drainage, article, May 22, 2009; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc933180/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.