Optimal parameters for a hierarchical grid data structure for contact detection in arbitrarily polydisperse particle systems

Introduction to discrete element methods

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A fast multilevel algorithm for contact detection of arbitrarily polydisperse objects

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A comparison of data structures for the simulation of polydisperse particle packings

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An efficient algorithm for detecting particle contact in non-uniform size particulate system

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A hierarchical search algorithm for discrete element method of greatly differing particle sizes

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