Coherent structures in wall turbulence and mechanism for drag reduction control

Chun Xiao Xu, Bing Qing Deng, Wei Xi Huang, Gui Xiang Cui

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1053-1061
Number of pages9
JournalScience China: Physics, Mechanics and Astronomy
Volume56
Issue number6
DOIs
StatePublished - Jun 2013
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 10925210 and 11132005).

Keywords

  • active control
  • coherent structure
  • drag reduction
  • wall turbulence

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