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Etude expérimentale des écoulements granulaires immergés

Abstract : This thesis presents an experimental and theoretical study
on submarine granular flows down inclined planes, a simplified model for
submarine avalanches in geophysics. This study is focused on the steady and
uniform flows, for grains completely immersed in water. Velocity and thickness
measurements of the flow show that we can define a dimensionless
number depending of the ratio of two characteristic times, that allows to
better understand such flows. The use of this dimensionless number to dry
or immersed flows allows to define a universal frictional rheology. Once incorporated
in a depth-averaged model, this rheology allows to define a stability
criterion between steady and unstable flows. This theoretical approach is in
qualitative agreement with the experimental observations. To better understand
the role of the interstitial fluid, we numerically studied the trajectory of
a porous block, sliding on a rough plane. In addition to the viscous dissipation,
the fluid can modify the trajectory of the porous block, and the margin
inclination of the plane where the porous block reaches a final velocity of sliding.
The last part of the manuscript presents perspectives about unsteady
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Contributor : Cyril Cassar <>
Submitted on : Monday, April 10, 2006 - 12:15:07 PM
Last modification on : Thursday, January 18, 2018 - 1:27:00 AM
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  • HAL Id : tel-00012103, version 1



Cyril Cassar. Etude expérimentale des écoulements granulaires immergés. Mécanique []. Université de Provence - Aix-Marseille I, 2005. Français. ⟨tel-00012103⟩



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