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La Recherchev2

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Micro-rheology of dense particulate flows : Application to immersed avalanches


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Journal of Non-Newtonian Fluid Mechanics, 2011, 166, Issues 1-2, p. 63-72.

Type de document > *Article de revue

Mots clés >

Unité de recherche > IRSN/DPAM/SEMCA/LESAM

Auteurs > TOPIN V., DUBOIS Frédéric, MONERIE Yann, PERALES Frédéric, WACHS A.

Date de publication > 15/01/2011

Résumé

We rely here on a non-smooth contact dynamics (NSCD) approach to treat particle collisions in a direct numerical simulation of a dense particulate flow. Interactions between particles are considered by a non-smooth formulation of particle dynamics at the microscopic scale, which enables one to straightforwardly implement complex contact laws. The hydrodynamic coupling is achieved by a distributed Lagrange multiplier/fictitious domain (DLM/FD) method. As a preliminary step, the relevance of our NSCD-DLM/FD method is assessed by comparing results of 2D sedimentation simulations with those obtained with a usual molecular dynamics collision model. Then, we use it to investigate how a fully immersed granular packing collapses depending on its initial particle volume fraction, providing clues on the micro-rheology of dense particulate flows.