Collapse dynamics and runout of dense granular materials in a fluidReport as inadecuate

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* Corresponding author 1 PMMG - Physique et Mécanique des Milieux Granulaires LMGC - Laboratoire de Mécanique et Génie Civil 2 MIST - Laboratoire de micromécanique et intégrité des structures

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.

Keywords : granular matter runout fluid-grain interactions contact dynamics avalanche

Author: Vincent Topin - Yann Monerie - Frédéric Perales - Farhang Radjai -



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