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Physical Review Letters 109 (2012) 188001

Collapse dynamics and runout of dense granular materials in a fluid

Topin Vincent (  Corresponding author ) 1, Yann Monerie 1, Perales Frédéric 1, Franck Radjai 1, 2

(2012)

We investigate the effect of an ambient fluid on the dynamics of collapse and spread of a granular column simulated by means of the contact dynamics method interfaced with computational fluid dynamics. The runout distance is found to increase as a power law with the aspect ratio of the column and, surprisingly, for a given aspect ratio and packing fraction, it may be similar in the grain-inertial and fluid-inertial regimes but with considerably longer duration in the latter case. We show that the effect of fluid in viscous and fluid-inertial regimes is to both reduce the kinetic energy during collapse and enhance the flow by lubrication during spread. Hence, the runout distance in a fluid may be below or equal to that in the absence of fluid due to compensation between those effects.

1:	Laboratoire de micromécanique et intégrité des structures (MIST)
	CNRS : UMR5508 – IRSN
2:	Laboratoire de mécanique et génie civil (LMGC)
	CNRS : UMR5508 – Université Montpellier II - Sciences et techniques

Research team: Physique et Mécanique des Milieux Granulaires

Subject

:

Physics/Mechanics/Mechanics of materials Engineering Sciences/Mechanics/Mechanics of materials

Keyword(s): granular matter – runout – fluid-grain interactions – contact dynamics – avalanche

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From: Farhang Radjai <>

Submitted on: Friday, 20 April 2012 03:02:32

Updated on: Monday, 11 March 2013 15:10:04