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

Vincent Topin (1, 2) , Frédéric Dubois (3) , Yann Monerie (1, 2) , Frédéric Perales (2, 4) , Anthony Wachs (5)

1 IRSN - Institut de Radioprotection et de Sûreté Nucléaire
2 MIST - Laboratoire de micromécanique et intégrité des structures
3 Remics - Réseaux, Moyens Informatiques, Calcul Scientifique
4 IRSN/DPAM/SEMCA/LEC - Laboratoire d'Etude du Combustible
5 IFPEN - IFP Energies nouvelles

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 straight forwardly implement complex contactlaws. 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.

Mots clés: Non-smooth contactdynamics; Contact rheology; Immersed avalanches; Distributed Lagrange multiplier/fictitious domain; Dense particulate flows

Domaines: Matériaux et structures en mécanique [physics.class-ph]; Matériaux et structures en mécanique [physics.class-ph]; Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]; Mécanique des solides [physics.class-ph]; Mécanique des solides [physics.class-ph]

Vincent Topin, Frédéric Dubois, Yann Monerie, Frédéric Perales, Anthony Wachs. Micro-rheology of dense particulate flows: Application to immersed avalanches. Journal of Non-Newtonian Fluid Mechanics, 2011, 166 (1-2), pp.63-72. ⟨10.1016/j.jnnfm.2010.10.006⟩. ⟨hal-00806645⟩