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.

引用

页数：4

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