Granular flows over a slope: experiments and models
| When |
May 30, 2017
from 10:45 to 12:00 |
|---|---|
| Where | Centre Blaise Pascal |
| Attendees |
Stéphanie Deboeuf |
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Granular material flowing on complex topographies are ubiquitous in industrial and geophysical situations (food-processing industry, civil engineering, rock avalanches, …). Even model granular flows are difficult to understand and predict. Recently, the frictional rheology mu(I) —describing the ratio of the shear stress to the normal stress as a function of the inertial number I, that compares inertial and confinement effects— allows unifying different configurations of granular flows [GDR MiDi 2004]. However, it does not succeed in describing some phenomenologies: creep flow, deposit height, ... Is it attributable to the rheology, to non-local effects, to the choice of the function mu(I), ...? To study these questions, our general approach is to compare experimental results, numerical simulations and analytical solutions. In this talk, I will present some experiments of a granular layer flowing on a slope (in 3d, in 2d, …) and I will focus on the front of the flow [Saingier et al 2016] and on its stopping dynamics. Comparisons are made with computations of St-Venant equations (depth-averaged mass and momentum equations) of the same configuration for a fluid of rheology mu(I).