Effect of particle surface friction on nonlocal constitutive behavior of flowing granular media
Name
40571_2014_18_ReferencePDF.pdf
Size
540.83 KB
Format
Adobe PDF
Checksum (MD5)
98452bb67959a36aa13e987a35275a94
Author(s)
Koval, Georg
Kamrin, Kenneth N.
Date Issued
May 2014
Journal
Computational Particle Mechanics
Publisher
Springer International Publishing
Citation
Kamrin, Ken, and Georg Koval. “Effect of Particle Surface Friction on Nonlocal Constitutive Behavior of Flowing Granular Media.” Computational Particle Mechanics 1, no. 2 (May 2, 2014): 169–176.
Version
Author's final manuscript
Abstract
A recently proposed nonlocal rheology for dense granular flow, based on the concept of nonlocal granular fluidity, has demonstrated predictive capabilities in multiple geometries. This work is concerned with determining how the parameters of this continuum model arise from the properties of the grains themselves. We perform a controlled study investigating how the surface friction of the grains influences the continuum parameters, with a focus on how the nonlocal amplitude, the model’s one new parameter, is affected. This is achieved comparing two-dimensional discrete-element simulations of flowing disks to numerical solutions of the model in planar shear and several annular shear geometries. A multi-step calibration scheme for the continuum parameter extraction is developed and implemented. Results indicate the nonlocal amplitude varies less than an order of magnitude over a wide range of surface frictions, with a slight tendency to increase as surface friction decreases, particularly in a regime of small surface friction. Our data also show that the stress and flow-rate variables deviate little from a local relationship as surface friction vanishes, which corroborates certain existing experimental findings.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/s40571-014-0018-3
