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Huang Leping Fan Baochun Dong Gang. Turbulent drag reduction via a streamwise traveling wave induced by spanwise wall oscillation[J]. Chinese Journal of Theoretical and Applied Mechanics, 2011, 43(2): 277-283. DOI: 10.6052/0459-1879-2011-2-lxxb2009-041
Citation: Huang Leping Fan Baochun Dong Gang. Turbulent drag reduction via a streamwise traveling wave induced by spanwise wall oscillation[J]. Chinese Journal of Theoretical and Applied Mechanics, 2011, 43(2): 277-283. DOI: 10.6052/0459-1879-2011-2-lxxb2009-041
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Turbulent drag reduction via a streamwise traveling wave induced by spanwise wall oscillation

  • Received Date: January 18, 2009
  • Revised Date: December 22, 2009
    Graphical Abstract
    • Abstract
  • The flow control and drag reduction in turbulent channelflow via streamwise traveling wave induced by spanwise-wall oscillation areinvestigated by direct numerical simulation (DNS). The effects of streamwisecontrol parameter kx on the Stokes layer, the near-wall flow structure,turbulent burst events, as well as the skin-friction drag are discussed. Inaddition, the mechanisms of turbulence suppression and drag reduction viastreamwise traveling wave induced by spanwise-wall oscillation are alsodiscussed. The results suggest that only the low-frequency waves have thesignificant influence on the flow field which induces the great variationsof frequency and the intensity of the burst which can be detected by thevariable-interval time averaging (VITA) detective technique. The variationsof the frequency and the intensity of the burst are unsynchronized as thekx increases, and there exists an optimal parameter, k_{x}, in whichthe influence of the intrinsic flow on the induced flow is weakest, and onthe contrary, the intrinsic turbulent flow is modified strongly by theinduced flow, and the largest amount of drag reduction is obtained.
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