Hydrodynamic modeling of granular flows in a modified Couette cell.
We present simulations of granular flows in a modified Couette cell, using a continuum model recently proposed for dense granular flows. Based on a friction coefficient, which depends on an inertial number, the model captures the positions of the wide shear bands. We show that a smooth transition in velocity-profile shape occurs when the height of the granular material is increased, leading to a differential rotation of the central part close to the surface. The numerical predictions are in qualitative agreement with previous experimental results. The model provides predictions for the increase of the shear band width when the rotation rate is increased.
Laboratoire de Physique de la Matière Condensée et Nanostructures, Université Lyon, Université Lyon 1, and CNRS UMR 5586, Domaine Scientifique de la Doua F-69622, Villeurbanne Cedex, France.
Pierre
P
Jop
D001703:Biophysics / Q000379:methods*; D003198:Computer Simulation; D017276:Friction; D008954:Models, Biological; D008956:Models, Chemical; D008958:Models, Molecular; D015233:Models, Statistical; D008962:Models, Theoretical; D009038:Motion; D016011:Normal Distribution; D011312:Pressure; D012212:Rheology; D013314:Stress, Mechanical; D013499:Surface Properties