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Turbulentlike Fluctuations in Quasistatic Flow of Granular Media

by: Farhang Radjai, Stéphane Roux
Physical Review Letters, Vol. 89 (Jul 2002), 064302, doi:10.1103/physrevlett.89.064302  Key: citeulike:11460563

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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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