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Kimberly Hill

Structure and kinematics in dense free-surface granular flow

Abstract: We show that dense, free-surface boundary layer flow is structured like a laminar liquid flow: there is strong component of order (stratification parallel to the mean flow) superposed with a mild component of disorder (self-diffusion perpendicular to the mean flow). We also show that the self-diffusion coefficient scales with the mean velocity and propose a model that relates this scaling to the ordered structure of the flow. Finally, we show that the laminar structure of the dense granular flow allows us to formulate a simple model to predict how the correlations of the velocity fluctuations vary across the thickness of the boundary layer.