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리블렛 표면을 이용한 난류 유동해석 및 마찰 저항감소

Turbulent Flow Analysis and Drag Reduction by Riblet Surfaces

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참고문헌

주제분류조선공학

초록

Abstract

performed to educe the mechanism of drag reduction by riblets. Numerical simulations are performed for flow fields with Re τ =180 . For riblet ridge angle α = 60o , 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 dragdecreasing 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.

참고문헌 (16)

  1. "Riblet 을 가진 난류 경계층의 난류구조 변화에 관한 연구" (1997)
  2. "미소기포 주입에의한 마찰저항 감소에 대한 연구", 40(3), pp.1~8 (2003)
  3. "폴리머 수용액 주입에 의한 난류마찰저항 감소에 대한 실험 연구", 40(3), pp.9~15 (2003)
  4. "횡방향 riblet 이선저의 공기 공동 형성에 미치는 영향", 19(20), pp.228~232 (2001)
  5. "마찰저항감소를 위한 난류유동의 DNS", LES 해석기술의 개발, 2004, pp.41(1), 47~54
  6. "선저에 부착된 공기 공동에 의한 선박의 저항감소에 관한 연구", 36(2), pp.1~8 (1999)
  7. "“ The viscous flow on surfaces withlongitudinal ribs", pp.105~129 (1989)
  8. "“ Directnumerical simulation of turbulent flow overriblets”", pp.503~539 (1993)
  9. "Near-wall structure ofturbulent boundary layer with riblets J. of FluidMechanics", 208, pp.417~458 (1989)
  10. "“ Adirect numerical simulation of laminar andturbulent flow over riblet-mounted surfaces”", pp.1~42 (1993)
  11. "Direct numerical simulation of turbulent flow over a modelled riblet-covered surface", 302, pp.333~376 (1995)
  12. "Magnetohydro-dynamic turbulent flow in a channel at low magnetic Reynolds number", 439, pp.369~394
  13. "Effects of uniform blowing or suction from a spanwise slot on a turbulent boundary layer", 11, pp.3095~3105 (1999)
  14. "Direct numerical simulation of heat transfer over riblets", 24, pp.356~371 (2003)
  15. "“ Turbule ntDrag Reduction Mechanism Above a RibletSurface.", pp.1781~1790 (1994)
  16. "“ Riblets as a Viscous DragReduction Technique”", 21, pp.485~486 (1983)

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