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20679 Friction dependence of shallow granular flows from discrete particle simulations

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Thornton, A.R. and Weinhart, T. and Luding, S. and Bokhove, O. (2011) Friction dependence of shallow granular flows from discrete particle simulations. Memorandum 1958, Department of Applied Mathematics, University of Twente, Enschede. ISSN 1874-4850

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Abstract

A shallow-layer model for granular flows is completed with a closure relation for the macroscopic bed friction or basal roughness obtained from micro-scale discrete particle simulations of steady flows. We systematically vary the bed friction by changing the contact friction coefficient between basal and flowing particles, while the base remains geometrically rough. By simulating steady uniform flow over a wide parameter range, we obtain a friction law that is a function of both flow and bed variables. Surprisingly, we find that the macroscopic bed friction is only weakly dependent on the contact friction of bed particles and predominantly determined by the properties of the flowing particles.

Item Type:	Internal Report (Memorandum)
Research Group:	EWI-MACS: Mathematics of Computational Science, CTW-MSM: Multi-Scale Mechanics
Research Program:	MESA-General
Research Project:	POLYGRAFIC: Polydispersed granular flows through inclined channels
Uncontrolled Keywords:	Complex fluids and colloidal systems, Granular flow, Granular systems, Avalanches, Rheology, Granular solids
ID Code:	20679
Deposited On:	13 October 2011
More Information:	statistics metis

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Friction dependence of shallow granular flows from discrete particle simulations (deposited 13 October 2011)
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- Frictional dependence of shallow-granular flows from discrete particle simulations (deposited 29 January 2013)

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