Spatio-temporally periodic control for turbulent friction drag reduction

Aiko Yakeno, Yosuke Hasegawa, Nobuhide Kasagi

研究成果: Paper査読

5 被引用数 (Scopus)

抄録

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.

本文言語English
ページ598-603
ページ数6
出版ステータスPublished - 2009
外部発表はい
イベント6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009 - Seoul, Korea, Republic of
継続期間: 2009 6月 222009 6月 24

Other

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

ASJC Scopus subject areas

  • 流体および伝熱

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