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Collapse Dynamics and Runout of Dense Granular Materials in a Fluid

TitleCollapse Dynamics and Runout of Dense Granular Materials in a Fluid
Publication TypeJournal Article
Year of Publication2012
AuthorsTopin V, Monerie Y, Perales F., Radjaï F
JournalPhysical Review Letters
Volume109
Issue18
PaginationArticle Number: 188001
Date PublishedNov-02-2012
ISSN0031-9007
DOI10.1103/PhysRevLett.109.188001
Short TitlePhys. Rev. Lett.
Full Text

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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