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Published on: December 4, 2017
Turbulentlike fluctuations in quasistatic flow of granular media
Farhang Radjai1, Stéphane Roux
1LMGC, CNRS-Université Montpellier II, Place Eugne Bataillon, 34095 Montpellier Cedex, France.
Abstract:
We analyze particle velocity fluctuations in a simulated granular system subjected to homogeneous quasistatic shearing. We show that these fluctuations share the following scaling characteristics of fluid turbulence in spite of their different physical origins: (i) scale-dependent probability distribution with non-Gaussian broadening at small time scales; (ii) spatial power spectrum of the velocity field showing a power-law decay, reflecting long-range correlations and the self-affine nature of the fluctuations; and (iii) superdiffusion of particles with respect to the mean background flow.
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