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Flow-obstacle interaction in rapid granular avalanches: DEM simulation and comparison with experiment

Teufelsbauer, Harald and Wang, Yongqi and Chiou, Min-Ching and Wu, W. (2009):
Flow-obstacle interaction in rapid granular avalanches: DEM simulation and comparison with experiment.
In: Granular Matter, Springer, pp. 209-220, 11, (4), ISSN 1434-5021,
DOI: 10.1007/s10035-009-0142-6,
[Online-Edition: http://www.springerlink.com/content/f837334345422496/],
[Article]

Abstract

This paper investigates the interaction between rapid granular flow and an obstacle. The distinct element method (DEM) is used to simulate the flow regimes observed in laboratory experiments. The relationship between the particle properties and the overall flow behaviour is obtained by using the DEM with a simple linear contact model. The flow regime is primarily controlled by the particle friction, viscous normal damping and particle rotation rather than the contact stiffness. Rolling constriction is introduced to account for dispersive flow. The velocity depth-profiles around the obstacles are not uniform but varying over the depth. The numerical results are compared with laboratory experiments of chute flow with dry granular material. Some important model parameters are obtained, which can be used to optimize defense structures in alpine regions.

Item Type: Article
Erschienen: 2009
Creators: Teufelsbauer, Harald and Wang, Yongqi and Chiou, Min-Ching and Wu, W.
Title: Flow-obstacle interaction in rapid granular avalanches: DEM simulation and comparison with experiment
Language: English
Abstract:

This paper investigates the interaction between rapid granular flow and an obstacle. The distinct element method (DEM) is used to simulate the flow regimes observed in laboratory experiments. The relationship between the particle properties and the overall flow behaviour is obtained by using the DEM with a simple linear contact model. The flow regime is primarily controlled by the particle friction, viscous normal damping and particle rotation rather than the contact stiffness. Rolling constriction is introduced to account for dispersive flow. The velocity depth-profiles around the obstacles are not uniform but varying over the depth. The numerical results are compared with laboratory experiments of chute flow with dry granular material. Some important model parameters are obtained, which can be used to optimize defense structures in alpine regions.

Journal or Publication Title: Granular Matter
Volume: 11
Number: 4
Publisher: Springer
Uncontrolled Keywords: Physics and Astronomy
Divisions: 16 Department of Mechanical Engineering > Fluid Dynamics (fdy)
16 Department of Mechanical Engineering
Date Deposited: 24 Aug 2011 18:13
DOI: 10.1007/s10035-009-0142-6
Official URL: http://www.springerlink.com/content/f837334345422496/
Additional Information:

DOI: 10.1007/s10035-009-0142-6

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