Dense granular rheology from fluctuations

Abstract

A governing equation for the granular temperature of flows past the jamming point is proposed and validated term-by-term with discrete element simulation. We measure and construct models for transport coefficients that do not diverge near the jamming fraction. As a limiting case of our equation, we derive the granular fluidity equation and find disagreement between the preexisting parametrizations of nonlocal granular fluidity, extended kinetic theory, and our discrete element simulations that is resolved by our continuum model.