Turbulentlike fluctuations in quasistatic flow of granular media |
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Authors: | Radjai Farhang Roux Stéphane |
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Institution: | LMGC, CNRS-Université Montpellier II, Place Eugne Bataillon, 34095 Montpellier Cedex, France. |
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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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