Drag reduction by streamwise traveling wave-like Lorenz force in channel flow

Hiroya Mamori, Koji Fukagata

研究成果: Conference article査読

5 被引用数 (Scopus)


Skin-friction drag reduction effect of traveling wave-like wall-normal Lorenz force in a fully developed turbulent channel flow is investigated by means of direct numerical simulation. A sinusoidal profile of the wall-normal body force is assumed as the Lorenz force. While upstream traveling waves reduce the drag in the case of blowing/suction, standing waves reduce it in the case of present forcing. Visualization of vortical structure under the standing wave-like wall-normal Lorenz force reveals that the near-wall streamwise vortices, which increase the skin-friction drag, disappear and spanwise roller-like vortices are generated instead. Three component decomposition of the Reynolds shear stress indicates that the spanwise roller-like vortices contribute to the negative Reynolds shear stress in the region near the wall, similarly to the case of laminar flows. While the analogy between the wall-normal and streamwise forcings can be expected, the statistics are found to exhibit different behaviors due to the difference in the energy flow.

ジャーナルJournal of Physics: Conference Series
出版ステータスPublished - 2011
イベント13th European Turbulence Conference, ETC13 - Warsaw, Poland
継続期間: 2011 9 122011 9 15

ASJC Scopus subject areas

  • 物理学および天文学(全般)


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