Microscopic foundation of the mu(I) rheology for dense granular flows on inclined planes

Macroscopic and microscopic properties of dense granular layers flowing down inclined planes are obtained from Discrete-Element-Method simulations for both frictionless and frictional grains. Three fundamental observations for dense granular flows are recovered, namely the occurrence of a critical stress, the Bagnold velocity profile, as well as well-defined friction and dilatancy laws. The microscopic aspects of the grain motion highlight the formation of transient clusters. From this microscopic picture, we derive a theoretical scaling model without any empirical input that explains quantitatively the fundamental laws of dense granular flows in incline plane and shear geometries. The adequacy between the model and the observed results suggests that granular flows can be viewed as flows from thermal fluids of hard spheres.

PHYSICAL REVIEW RESEARCH

By: Dumont, Denis / Bonneau, Haggai / Salez, Thomas / Raphael, Elie / Damman, Pascal

Volume 5, Issue 1, Article Number 013089
DOI: https://doi.org/10.1103/PhysRevResearch.5.013089

Published FEB 2023


Top



See also...

Active versus Passive Hard Disks against a Membrane: Mechanical Pressure and Instability

G. Junot,1 G. Briand,1 R. Ledesma-Alonso,1,2 and O. Dauchot1 1UMR Gulliver 7083 CNRS, ESPCI ParisTech, PSL Research University, 10 rue Vauquelin, (...) 

> More...

Spontaneous self-constraint in active nematic flows

Active processes drive biological dynamics across various scales and include subcellular cytoskeletal remodelling, tissue development in (...) 

> More...