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Ecoulements granulaires sur fond meuble

Abstract : Dense granular flows, which are common in nature and industry, have peculiar characteristics that seem to strongly depend on geometries. When the bottom, which supports the flow, can be eroded, the mechanisms determining the position of the liquid-solid interface or the velocity of the grains down the slope are not yet well understood. This case underlines the lack of knowledge about the rheology of dense granular flows. The experimental study of flows on heap is the central part of this thesis.

In order to provide a detailed description of flows on heap, we first carried out an experimental study of the stationary flows in a channel. Systematic measurements allowed us to highlight the important role of sidewalls in such systems: the flow properties are completely controlled by the width of the channel. According to this result, we proposed a model based on a recent rheology. This rheology has been then extended to three dimensions and was applied to our configuration. Numerical simulations quantitatively reproduce the properties of steady flows . We finally studied a peculiar avalanche in order to understand the exchange between the flowing layer and the bottom by following the flowing-thickness during the transient regime. In spite of some limits, this work shows the relevance of a local rheology, which opens the way to more complete model of the dense granular flows.
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https://tel.archives-ouvertes.fr/tel-00106185
Contributor : Pierre Jop <>
Submitted on : Friday, October 13, 2006 - 1:42:11 PM
Last modification on : Saturday, November 14, 2020 - 3:09:36 AM
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Pierre Jop. Ecoulements granulaires sur fond meuble. Dynamique des Fluides [physics.flu-dyn]. Université de Provence - Aix-Marseille I, 2006. Français. ⟨tel-00106185⟩

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