Journal
JOURNAL OF FLUID MECHANICS
Volume 764, Issue -, Pages 171-192Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2014.707
Keywords
granular mixing; particle/fluid flow; rheology
Categories
Funding
- ANR [JCJC SIMI 9]
- Labex MEC [ANR-11-LABX-0092]
- A*MIDEX [ANR-11-IDEX-0001-02]
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We explore how the rheology of dense granular flows is affected by the presence of sidewalls. The study is based on discrete element method simulations of plane-shear flows between two rough walls, prescribing both the normal stress and the shear rate. Results confirm previous observations for different systems: large layers near the walls develop where the local viscosity is not constant, but decreases when approaching the walls. The size of these layers can reach several dozen grain diameters, and is found to increase when the flow decelerates, as a power law of the inertial number. Two non-local models are found to adequately explain such features, namely the kinetic elasto-plastic fluidity (KEP) model and the eddy viscosity model (EV). The analysis of the internal kinematics further shows that the vorticity and its associated length scale may be a key component of these non-local behaviours.
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