Inertial Force Transmission in Dense Granular Flows

TL;DR

This paper investigates the internal force transmission mechanisms in dense granular flows, revealing how contact forces depend on flow rate and grain stiffness, and proposing a unifying physical explanation.

Contribution

It introduces a physical mechanism linking contact forces and grain velocities, advancing understanding of force transmission in dense granular flows.

Findings

High magnitude contact forces occur in faster flows with stiffer grains

A rate-dependent force transmission mechanism is proposed

Establishes a relation between contact forces and grain velocities

Abstract

Dense granular flows are well described by several continuum models, however, their internal dynamics remain elusive. This study explores the contact force distributions in simulated steady and homogenous shear flows. Results demonstrate the existence of high magnitude contact forces in faster flows with stiffer grains. A proposed physical mechanism explains this rate-dependent force transmission. This analysis establishes a relation between contact forces and grain velocities, providing an entry point to unify a range of continuum models derived from either contact forces or grain velocity.