Active wall motions for skin-friction drag reduction

被引:84
作者
Kang, S [1 ]
Choi, H
机构
[1] Taegu Univ, Sch Automot Ind & Mech Engn, Kyungsan 712714, Kyungbuk, South Korea
[2] Seoul Natl Univ, Sch Mech & Aerosp Engn, Seoul 151742, South Korea
[3] Seoul Natl Univ, Inst Adv Machinery & Design, Natl CRI Ctr Turbulence & Flow Control Res, Seoul 151, South Korea
关键词
D O I
10.1063/1.1320833
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
In the present study we investigate a possibility of reducing skin-friction drag in a turbulent channel flow with active wall motions. The wall is locally deformed according to two successful control strategies [J. Fluid Mech. 262, 75 (1994); J. Fluid Mech. 358, 245 (1998)]. Results show that overall 13-17% drag reductions are obtained with the active wall motions, and turbulence intensities and near-wall streamwise vortices are significantly weakened. It is remarkable that instantaneous wall shapes are elongated in the streamwise direction and resemble riblets in appearance. However, the mechanism of the present drag reduction is essentially different from that of riblets. (C) 2000 American Institute of Physics. [S1070-6631(00)51412-3].
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页码:3301 / 3304
页数:4
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