Spatio-temporally periodic control for turbulent friction drag reduction

Aiko Yakeno, Yosuke Hasegawa, Nobuhide Kasagi

Research output: Contribution to conferencePaper

3 Citations (Scopus)

Abstract

We evaluate the pre-determined control with temporally- and spatially-periodic spanwise velocity inputs at the wall in a fully developed two-dimensional turbulent channel flow. The spatially-periodic control generally achieves better performance than the temporally-periodic control, the latter of which is called conventionally the spanwise wall-oscillation control. To analyze the drag reducing mechanisms, we focus on the near-wall structures such as quasi-streamwise vortices and low-speed streaks. As a result, it is found that the drag is reduced through the modified spatial phase-relationship between the streamwise vortex and the low-speed streak.

Original languageEnglish
Pages598-603
Number of pages6
Publication statusPublished - 2009 Jan 1
Externally publishedYes
Event6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009 - Seoul, Korea, Republic of
Duration: 2009 Jun 222009 Jun 24

Other

Other6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009
CountryKorea, Republic of
CitySeoul
Period09/6/2209/6/24

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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  • Cite this

    Yakeno, A., Hasegawa, Y., & Kasagi, N. (2009). Spatio-temporally periodic control for turbulent friction drag reduction. 598-603. Paper presented at 6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009, Seoul, Korea, Republic of.