Turbulent spots in a channel: large-scale flow and self-sustainability

被引：33
|
作者：
Lemoult, Gregoire [1 ]
Aider, Jean-Luc [1 ]
Wesfreid, Jose Eduardo [1 ]
机构：
[1] UPMC, ESPCI, UMR CNRS 7636, Lab Phys & Mecan Milieux Heterogenes PMMH, F-75005 Paris, France
来源：
JOURNAL OF FLUID MECHANICS | 2013年 / 731卷
关键词：
channel flow; nonlinear instability; transition to turbulence; PLANE POISEUILLE FLOW; SHEAR FLOWS; NUMERICAL SIMULATIONS; STREAMWISE STREAKS; TRANSITION; STABILITY; VISUALIZATION;
D O I：
10.1017/jfm.2013.388
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Using a large-time-resolved particle image velocimetry field of view, a developing turbulent spot is followed in space and time in a rectangular channel flow for more than 100 advective time units. We show that the flow can be decomposed into a large-scale motion consisting of an asymmetric quadrupole centred on the spot and a small-scale part consisting of streamwise streaks. From the temporal evolution of the energy of the streamwise and spanwise velocity perturbations, it is suggested that a self-sustaining process can occur in a turbulent spot above a given Reynolds number.
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页数：12
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