Volume 76, Number 2, October 2006
|Page(s)||318 - 324|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||13 September 2006|
Emergence of multi-contact interactions in contact dynamics simulations of granular shear flows
Physics Department, University of California - Santa Barbara, CA 93106, USA
2 Institut Navier-LMSGC - 2 allée Képler, 77420 Champs-sur-Marne, France
Accepted: 23 August 2006
We examine the binary collision assumption of hard-sphere kinetic theory in numerical simulations of sheared granular materials. For a wide range of densities and restitution coefficients we measure collisional and non-collisional contributions to the stress tensor and find that non-collisional effects dominate at large density and small restitution coefficient. In the regimes where the non-collisional contributions disappear, we test kinetic theory predictions for the pressure without any fitting parameters and find remarkable agreement. In the regimes where the non-collisional contributions become large, we observe groups of simultaneously interacting grains and determine the average multi-contact cluster size using measurements of spatial force correlations.
PACS: 81.05.Rm – Porous materials; granular materials / 05.20.Dd – Kinetic theory / 89.75.Fb – Structures and organization in complex systems
© EDP Sciences, 2006
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