A non-local rheology for granular flows across yield conditions

Mehdi Bouzid, Martin Trulsson, Philippe Claudin, Eric Clément, Bruno Andreotti

Research output: Contribution to journalArticlepeer-review

Abstract

The rheology of dense granular flows is studied numerically in a shear cell controlled at constant pressure and shear stress, confined between two granular shear flows. We show that a liquid state can be achieved even far below the yield stress, whose flow can be described with the same rheology as above the yield stress. A nonlocal constitutive relation is derived from dimensional analysis through a gradient expansion and calibrated using the spatial relaxation of velocity profiles observed under homogeneous stresses. Both for frictional and frictionless grains, the relaxation length is found to diverge as the inverse square root of the distance to the yield point, on both sides of that point.
Original languageEnglish
JournalPhysical Review Letters
DOIs
Publication statusPublished - 4 Dec 2013

Keywords

  • cond-mat.soft

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