Three-dimensional shear in granular flow

Abstract

The evolution of granular shear flow is investigated as a function of height in a split-bottom Couette cell. Using particle tracking, magnetic-resonance imaging, and large-scale simulations we find a transition in the nature of the shear as a characteristic height $H^{\ast }$ is exceeded. Below $H^{\ast }$ there is a central stationary core; above $H^{\ast }$ we observe the onset of additional axial shear associated with torsional failure. Radial and axial shear profiles are qualitatively different: the radial extent is wide and increases with height while the axial width remains narrow and fixed.

4 pages, 5 figures

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• Transients in sheared granular matter

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