Micro-rheology of dense particulate flows : Application to immersed avalanches
15/01/2011
Journal of Non-Newtonian Fluid Mechanics, 2011, 166, Issues 1-2, p. 63-72.
Type de document >
*Article de revue
Unité de recherche >
IRSN/DPAM/SEMCA/LESAM
Auteurs >
TOPIN V.
,
DUBOIS Frédéric
,
MONERIE Yann
,
PERALES Frédéric
,
WACHS A.
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.
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