Slow dynamics in a turbulent von karman swirling flow

被引：80
|
作者：
de la Torre, A. [1 ]
Burguete, J. [1 ]
机构：
[1] Univ Navarra, Dept Fis & Matemat Aplicada, E-31080 Pamplona, Spain
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 05期
关键词：
D O I：
10.1103/PhysRevLett.99.054101
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
An experimental study of a turbulent von Karman flow in a cylinder is presented. The mean flow is stationary up to a Reynolds number Re = 10(4) where a bifurcation takes place. The new regime breaks some symmetries of the problem and becomes time dependent because of equatorial vortices moving with a precession movement. In the exact counterrotating case, a bistable regime appears and spontaneous reversals of the azimuthal velocity are registered. A three-well potential model with additive noise reproduces this dynamic. A regime of periodic response is observed when a very weak forcing is applied.
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