Lecturer: Dr. Stephanie Deboeuf
Affiliation: Institut Jean le Rond d'Alembert,
Université Pierre et Marie Curie
Abstract:
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 μ(I) - describing the ratio of the
shear stress to the normal stress as a
function of the inertia number I, which
compares inertial and confinement effects
- allows unifying different configurations
of granular flows [GDR MiDi 2004].
However, it does not succeed in
describing some phenomenology, namely
creep flow, deposit height, and more. Is it
related to the rheology, non-local effects,
the choice of the function μ(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 μ(I).