Effect of Contact Force Models on Granular Flow Dynamics
Publication: Journal of Engineering Mechanics
Volume 132, Issue 11
Abstract
The contact force model consisting of a linear spring dashpot with a frictional glider has been widely adapted to simulate granular flows. Real contact mechanics between two solid bodies is very complicated. Extensive theoretical and experimental studies exist for binary contacts. Very little work has been reported that addresses the effect of contact mechanics on the bulk behavior of granular materials. We first briefly summarize the difference of binary contacts between a linear spring–dashpot model and the Hertzian nonlinear spring with two nonlinear dashpot models. We then compare the constitutive behaviors of a granular material using a linear and a nonlinear model. The stress- and strain-rate relation in simple shear flow and the resulting coordination number are calculated using the discrete element method. It is found that although at the grain level binary contact between two particles depends on whether a linear or a nonlinear model is used, the bulk behavior of granular materials is qualitatively similar with either model.
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Acknowledgments
The writers appreciate the comments from the anonymous reviewers, based on which Figs. 6 and 7 and the associated discussions were added. This study is supported by NASA microgravity fluids program Grant No. NAG3-2717.
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Information & Authors
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Published In
Journal of Engineering Mechanics
Volume 132 • Issue 11 • November 2006
Pages: 1252 - 1259
Copyright
© 2006 ASCE.
History
Received: Aug 29, 2005
Accepted: Apr 26, 2006
Published online: Nov 1, 2006
Published in print: Nov 2006
Notes
Note. Associate Editor: Ching S. Chang
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