Dense granular suspensions exhibit different regimes based on boundary conditions and stress distribution. The flow is mainly controlled by the shear rate to particle pressure ratio, which can be described by a frictional approach for dilatant granular media. However, as the shear rate increases and the fluid viscosity decreases, the flow can transition from a viscous to an inertial regime....
Les précurseurs d'avalanche sont de petits déplacements de surface quasi-périodiques, observés expérimentalement lors de l'inclinaison lente d'un lit granulaire. L'avalanche apparaît dans la séquence des précurseurs, comme le point culminant d'une séquence d'événements qui le procède. Une compréhension des précurseurs éclairerait donc le déclenchement des écoulements granulaires.
Une...
Dense granular flows can spontaneously self-channelise by forming a pair of parallel-sided static levees on both sides of a central flowing channel. This process prevents lateral spreading and maintains the flow mobility for longer, enabling the avalanche to run out considerably further than a spreading flow. Since levees commonly form in hazardous geophysical mass flows, such as snow...
