Viscoinertial regime of immersed granular flows

Type Article
Date 2017-07
Language English
Author(s) Amarsid L.1, 2, 3, Delenne J. -Y.4, Mutabaruka PatrickORCID5, Monerie Y.2, 3, Perales F.1, 6, Radjai F.2, 3, 5
Affiliation(s) 1 : CE Cadarache, IRSN, PSN, BP3, F-13115 St Paul Les Durance, France.
2 : Univ Montpellier, CNRS, LMGC, 163 Rue Auguste Broussonnet, F-34090 Montpellier, France.
3 : Univ Montpellier, CNRS, IRSN, Lab MIST, Montpellier, France.
4 : Univ Montpellier SupAgro, INRA, CIRAD, IATE,UMR1208, F-34060 Montpellier, France.
5 : MIT, CNRS, MSE 2, UMI, 77 Massachusetts Ave, Cambridge, MA 02139 USA.
6 : Univ Montpellier 2, CNRS, IRSN, Lab MIST, Montpellier, France.
Source Physical Review E (2470-0045) (Amer Physical Soc), 2017-07 , Vol. 96 , N. 1 , P. 012901 (7p.)
DOI 10.1103/PhysRevE.96.012901
WOS© Times Cited 56
Abstract

By means of extensive coupled molecular dynamics-lattice Boltzmann simulations, accounting for grain dynamics and subparticle resolution of the fluid phase, we analyze steady inertial granular flows sheared by a viscous fluid. We show that, for a broad range of system parameters (shear rate, confining stress, fluid viscosity, and relative fluid-grain density), the frictional strength and packing fraction can be described by a modified inertial number incorporating the fluid effect. In a dual viscous description, the effective viscosity diverges as the inverse square of the difference between the packing fraction and its jamming value, as observed in experiments. We also find that the fabric and force anisotropies extracted from the contact network are well described by the modified inertial number, thus providing clear evidence for the role of these key structural parameters in dense suspensions.

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