The autonomous cycle of near-wall turbulence

被引:654
作者
Jiménez, J [1 ]
Pinelli, A
机构
[1] Univ Politecn Madrid, Sch Aeronaut, E-28040 Madrid, Spain
[2] Stanford Univ, Ctr Turbulent Res, Stanford, CA 94305 USA
关键词
D O I
10.1017/S0022112099005066
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Numerical experiments on modified turbulent channels at moderate Reynolds numbers are used to differentiate between several possible regeneration cycles for the turbulent fluctuations in wall-bounded flows. It is shown that a cycle exists which is local to the near-wall region and does not depend on the outer flow. It involves the formation of velocity streaks from the advection of the mean profile by streamwise vortices, and the generation of the vortices from the instability of the streaks. Interrupting any of those processes leads to laminarization. The presence of the wall seems to be only necessary to maintain the mean shear. The generation of secondary vorticity at the wall is shown to be of little importance in turbulence generation under natural circumstances. Inhibiting its production increases turbulence intensity and drag.
引用
收藏
页码:335 / 359
页数:25
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