Suction effect on an impulsively started circular cylinder: Vortex structure and drag reduction

Chin Chou Chu, Chien Cheng Chang, Cheng Chien Liu, Ray Lin Chang

研究成果: Article同行評審

6 引文 斯高帕斯(Scopus)


Drag reduction on an impulsively started circular cylinder by surface suction has been investigated with a joint numerical and experimental study. Two suction slots entraining mass with various rates were located symmetrically in a range of angles downstream of the points of zero shear stress. The Reynolds number Re of this study was between 500 and 2000, while the suction coefficient M varied from 0 to 0.08. Analysis based on the force contributed by fluid elements with nonvanishing voracity [Chang, Proc. R. Soc. London Ser. A 437, 517 (1992)] has provided a clear view of the physical mechanism causing the drag reduction. For the impulsive flow with surface suction, the initial drag reduction is due to the strengthening of the front boundary layer, while the slender vortices in the near wake due to suction then become the dominant factor in reduction of the drag force in later stages. Close agreements were found between the experimental and numerical results, including streakline flow visualization and surface vorticity measurements on the top of the cylinder. In addition, a parametric study on the slot location, the suction angle, and the width of the suction slot has also been carried out in detail.

頁(從 - 到)2995-3007
期刊Physics of Fluids
出版狀態Published - 1996 11月

All Science Journal Classification (ASJC) codes

  • 計算力學
  • 凝聚態物理學
  • 材料力學
  • 機械工業
  • 流體流動和轉移過程


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