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.

引用

页数：12

共 35 条

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