DUMONT, Denis; SOULARD, Pierre; SALEZ, Thomas; RAPHAEL, Elie; DAMMAN, Pascal

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DUMONT, Denis
Laboratoire Interfaces et Fluides Complexes [Mons] [LIFC]

SOULARD, Pierre
Gulliver (UMR 7083)

SALEZ, Thomas
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Ce document a été publié dans

Physical Review Letters. 2020-11-10, vol. 125, p. 208002

American Physical Society

Résumé en anglais

Gravity-driven flows of granular matter are involved in a wide variety of situations, ranging from industrial processes to geophysical phenomena, such as avalanches or landslides. These flows are characterized by the coexistence of solid and fluid phases, whose stability is directly related to the erosion and sedimentation occurring at the solid-fluid interface. To describe these mechanisms, we build a microscopic model involving friction, geometry, and a nonlocal cooperativity emerging from the propagation of collisions. This new picture enables us to obtain a detailed description of the exchanges between the fluid and solid phases. The model predicts a phase diagram including erosion, sedimentation, and stationary-flow regimes, in quantitative agreement with experiments and discrete-element-method simulations.< Réduire

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798