Coherent structures in wall turbulence and mechanism for drag reduction control

Herein is introduced the mechanism for active control influencing the generation of the near-wall streamwise vortices,which are closely related to the production of high skin friction in wall-bounded turbulent flows.A new opposition control scheme with adjusting control amplitude is proposed and eva...

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Bibliographic Details
Published in:Science China. Physics, mechanics & astronomy mechanics & astronomy, 2013-06, Vol.56 (6), p.1053-1061
Main Authors: Xu, ChunXiao, Deng, BingQing, Huang, WeiXi, Cui, GuiXiang
Format: Article
Language:English
Subjects:
Active control
Astronomy
Channel flow
Classical and Continuum Physics
Direct numerical simulation
Drag reduction
Fluid dynamics
Fluid flow
High Reynolds number
Mathematical models
Observations and Techniques
Physics
Physics and Astronomy
Skin friction
Turbulence
Turbulent flow
主动控制
减阻率
增长模型
控制方案
机制
湍流相干结构
直接数值模拟
结构控制
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Summary:Herein is introduced the mechanism for active control influencing the generation of the near-wall streamwise vortices,which are closely related to the production of high skin friction in wall-bounded turbulent flows.A new opposition control scheme with adjusting control amplitude is proposed and evaluated in turbulent channel flow by direct numerical simulations.The maximum drag reduction rate can be greatly enhanced by the strengthened control.Finally the effectiveness of the control to the coherent structures at high Reynolds numbers is investigated by using a linear transient growth model.
ISSN:1674-7348
1869-1927
DOI:10.1007/s11433-013-5087-4