Collapse dynamics and runout of dense granular materials in a fluid

Abstract : 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.
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Physical Review Letters, American Physical Society, 2012, 109, pp.188001
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Vincent Topin, Yann Monerie, Frédéric Perales, Farhang Radjai. Collapse dynamics and runout of dense granular materials in a fluid. Physical Review Letters, American Physical Society, 2012, 109, pp.188001. 〈hal-00689730〉

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