François Lequeux

Title:
Pasty fluids modeling : a physicist point of view

Abstract:
Many complex fluids exhibit a yield stress : below some stress, they are solid like, while above the flow. This plastic behavior is complex, because the state in the absence of shear is not unique. In addition and as a consequence, the yield stress fluids that are sensitive to themral motions exhibit aging. I will describe how it is possible to write simple models that take into accounts these coupled phenomena.