Abstract
Surface flow down a granular pile (“avalanches”) can be excited by shear forces or by vibration. Based on a generalization of a recently proposed minimal dynamical mean field model, we discuss theoretically how a periodically modulated shear rate about a zero mean can change the dynamics of avalanches. In particular, we report the unexpected effect of non-periodic avalanching due to periodic driving. The predicted effects should be experimentally observable in two-dimensional drums by modulating the rotation rate.
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