In search of a rheology for granular flows
Dr. Lydie Staron (Institut Jean le Rond d'Alembert, CNRS-Universite )
Thursday 20th May, 2010 14:00-15:00 326
In spite of their huge importance in natural processes (catastrophic flows, erosion and transport) and in human activity (industrial handling and geo-technics), granular flows escape in a large extent understanding, and thus theoretical modelling. Oddly enough, systems as simple as stationary mono-disperse flows still presents many unexplained features; modelling their rheology remains a challenge. In this seminar, we will illustrate different aspects of the behaviour of granular flows using discrete numerical experiments. In particular, we will discuss existing rheological models and try to relate them to local mechanisms at the grains scale. This will lead us to suggest the existence of non-local behaviour in granular systems.