Numerical Tests of Constitutive Laws for Dense Granular Flows

TL;DR

This paper combines numerical simulations and theoretical analysis to develop and validate constitutive laws for dense granular flows, linking invariance principles, granular temperature, and shear transformation zone theory.

Contribution

It introduces a unified constitutive framework for dense granular flows based on invariance, granular temperature, and STZ theory, validated across different geometries.

Findings

Constitutive laws match numerical data well

Invariance explains Bagnold's scaling

Granular temperature dynamics relate to flow behavior

Abstract

We numerically and theoretically study macroscopic properties of dense, sheared granular materials. In this process we first introduce an invariance in Newton's equations, explain how it leads to Bagnold's scaling, and discuss how it relates to the dynamics of granular temperature. Next we implement numerical simulations of granular materials in two different geometries-- simple shear and flow down an incline-- and show that measurements can be extrapolated from one geometry to the other. Then we observe non-affine rearrangements of clusters of grains in response to shear strain and show that fundamental observations, which served as a basis for the Shear Transformation Zone (STZ) theory of amorphous solids, can be reproduced in granular materials. Finally we present constitutive equations for granular materials, based on the dynamics of granular temperature and STZ theory, and show that they match remarkably well with our numerical data from both geometries.