Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Turbulent Flow Analysis and Drag Reduction by Riblet Surfaces

리블렛 표면을 이용한 난류 유동해석 및 마찰 저항감소

  • 윤현식 (부산대학교 첨단조선공학연구센터) ;
  • 구본국 (부산대학교 첨단조선공학연구센) ;
  • 전호환 (부산대학교 첨단조선공학연구센터)
  • Published : 2004.08.01
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Abstract

Direct numerical simulations of turbulent flows over riblet-mounted surfaces are performed to educe the mechanism of drag reduction by riblets. Numerical simulations are performed for flow fields with R $e_$\tau$/=180. For riblet ridge angle $\alpha$=60$^{\circ}$, two different riblet spacings of $s^+/=20 and 40 are used in this study. The computed drag on the riblet surfaces is in good agreement with existing computational and experimental data. The mean velocity profiles show upward and downward shifts in the log-law for drag-decreasing and drag-increasing cases, respectively Turbulence statistics above the riblets are computed and compared with those above a flat plate. The purpose of this study is in two categories: first, to understand the drag reduction mechanism on riblet surface, second, to verify our own code by comparison of the present results with those from previous studies.udies.

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References

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