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Olivier Pouliquen

Dense flows of granular material down a slope

Abstract: The description of dense dry granular flows still represents a challenge, as these flows belong to an intermediate flow regime where both friction and collision are important. The medium flows like a fluid but particles do not interact trough binary collisions only. Are these flows to be considered as dense granular gases or as plastic flows with inertial effects? The dense granular regime has recently motivated a lot of experimental, numerical and theoretical works where questions about velocity profiles, rheology, existence or not of clusters or correlations are discussed. These issues will be first explored trough experimental and numerical results obtained in the inclined plane configuration where a granular material flows down a bumpy plane. The link with the other flow geometries will then be discussed.