The non-local repercussions of partial jamming in dense granular flows

Abstract

This paper establishes a link between the non-local behaviour of granular materials and the presence of transient clusters of jammed particles within the flow. These clusters are first evidenced in simulated dense granular flows subjected to plane shear, and are found to originate from a mechanism of multiple orthogonal shear banding. A continuum non-local model, similar in form to the non-local Cooperative model, is then derived by considering the spatial redistribution of vorticity induced by these clusters. The non-locality length scale is thus expressed in terms of the cluster size. The purely kinematic nature of this derivation indicates that non-local behaviour should be expected in all glassy materials, regardless of their local constitutive law, as long as they partially jam during flow.

Effect of friction on dense suspension flows of hard particles

“…In support of this picture, approximately rigid-body motion has been suggested to occur in granular flows [25][26][27][28]. However, scaling relations from elastoplasticity concerning microscopic flow heterogeneity have not previously been tested.…”

Unifying Suspension and Granular flows near Jamming

“…For example, the relative velocity between contacting particles differs from the amplitude of non-affine velocities. This additional complexity is plausibly caused by the intermittent and non-extensive localization of strain observed in several studies [44][45][46][47]. A similar localization is observed in the plasticity of soft particles [48], whose connection to hard frictional particles is, however, unclear.…”