Stress and large-scale spatial structures in dense, driven granular flows

Abstract

We study the appearance of large-scale dynamical heterogeneities in a simplified model of a driven, dissipative granular system. Simulations of steady-state gravity-driven flows of inelastically colliding hard disks show the formation of large-scale linear structures of particles with a high collision frequency. These chains can be shown to carry much of the collisional stress in the system due to a dynamical correlation that develops between the momentum transfer and time between collisions in these "frequently-colliding" particles. The lifetime of these dynamical stress heterogeneities is seen to grow as the flow velocity decreases towards jamming, leading to slowly decaying stress correlations reminiscent of the slow dynamics observed in supercooled liquids.

8 pages, 6 figures

References in corpus (5)

• Velocity correlations in dense granular flows
• Diffusion and mixing in gravity-driven dense granular flows
• Friction vs Texture at the Approach of a Granular Avalanche
• Tensorial Constitutive Models for Disordered Foams, Dense Emulsions, and other Soft Nonergodic Materials
• Temporally heterogeneous dynamics in granular flows

Cited by in corpus (8)

• A statistical mechanics framework for static granular matter
• Orientation, Flow, and Clogging in a Two-Dimensional Hopper: Ellipses vs. Disks
• Equipartition of rotational and translational energy in a dense granular gas
• Athermal analogue of sheared dense Brownian suspensions
• Growing length scale in gravity-driven dense granular flow
• Inelastic collapse in one-dimensional driven systems under gravity
• Simulations of collision times in gravity driven granular flow
• Chain structure of head-on collisions in boundary driven granular gases