Intermittency of the velocity fluctuations in a granular surface flow

被引：6
|
作者：
Kellay, H. [1 ]
Amarouchene, Y. [1 ]
Boudet, J. F. [1 ]
机构：
[1] Univ Bordeaux 1, CNRS, Ctr Phys Mol Opt & Hertzienne, UMR 5798, F-33405 Talence, France
来源：
PHYSICS OF FLUIDS | 2007年 / 19卷 / 07期
关键词：
D O I：
10.1063/1.2750679
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Velocity fluctuations in a granular surface flow are studied. These fluctuations are self-similar at small scales with an energy density spectrum showing a -5/3 power law. The probability density functions of velocity increments are strongly non-Gaussian. The moments of velocity differences between two points separated by a distance r vary as a power law with the scale r; the exponents saturate at a value of 2/3 showing very strong intermittency of the velocity fluctuations. (c) 2007 American Institute of Physics.
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