Influence of lateral confinement on granular flows: comparison between shear-driven and gravity-driven flows
Abstract
The properties of confined granular flows are studied through discrete numerical simulations. Two types of flows with different boundaries are compared: (i) gravity-driven flows topped with a free surface and over a base where erosion balances accretion (ii) shear-driven flows with a constant pressure applied at their top and a bumpy bottom moving at constant velocity. In both cases we observe shear localization over or/and under a creep zone. We show that, although the different boundaries induce different flow properties (e.g. shear localization of transverse velocity profiles), the two types of flow share common properties like (i) a power law relation between the granular temperature and the shear rate (whose exponent varies from 1 for dense flows to 2 for dilute flows) and (ii) a weakening of friction at the sidewalls which gradually decreases with the depth within the flow.
Cite
@article{arxiv.2009.12182,
title = {Influence of lateral confinement on granular flows: comparison between shear-driven and gravity-driven flows},
author = {Patrick Richard and Riccardo Artoni and Alexandre Valance and Renaud Delannay},
journal= {arXiv preprint arXiv:2009.12182},
year = {2020}
}