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Article Dans Une Revue Granular Matter Année : 2020

Influence of lateral confinement on granular flows: comparison between shear-driven and gravity-driven flows

Résumé

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.
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Dates et versions

hal-02948732 , version 1 (25-09-2020)

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Patrick Richard, Riccardo Artoni, Alexandre Valance, Renaud Delannay. Influence of lateral confinement on granular flows: comparison between shear-driven and gravity-driven flows. Granular Matter, 2020, 22 (4), ⟨10.1007/s10035-020-01057-3⟩. ⟨hal-02948732⟩
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