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Numerical Analysis of Hydrodynamic Performance of Finite Span Hydrofoil

Research Project

Project/Area Number 02302054
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 船舶抵抗・運動性能・計画
Research InstitutionThe University of Tokyo

Principal Investigator

KATO Hiroharu  The University of Tokyo Professor, 工学部, 教授 (00010695)

Co-Investigator(Kenkyū-buntansha) NAKATAKE Kuniharu  Kyushu University Professor, 工学部, 教授 (70037761)
MORI Kazuhiro  Hiroshima University Professor, 工学部, 教授 (90011171)
NAKATO Michio  Hiroshima University Professor, 工学部, 教授 (20034324)
YAMAGUCHI Hajime  The University of Tokyo Assistant Professor, 工学部, 助教授 (20166622)
KAJITANI Hisashi  The University of Tokyo Professor, 工学部, 教授 (80010693)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥10,500,000 (Direct Cost: ¥10,500,000)
Fiscal Year 1991: ¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 1990: ¥6,300,000 (Direct Cost: ¥6,300,000)
KeywordsFinite Span Foil / Finite Difference Method / Lifting Body Theory / Cavitation / Free Surface / Tip Vortex / CFD / 有限幅直進翼
Research Abstract

Made were the numerical and experimental investigations on the hydrodynamic performance and flow situations of a finite span hydrofoil. The following results were obtained :
The lift and drag forces and the pressure distribution obtained by the lifting body theory agreed well with those of the experiments unless the large boundary layer separation occurred on the hydrofoil surface.
This theory, however, could not argue the details of the flow situations such as boundary layer and its relation to the tip vortex.
Two kinds of finite difference calculations were made with a low Reynolds number of 1, 000. Some kinds of calculation conditions were selected such as with free surface and with cavitation. The results were compared and discussed in detail with the experimental ones. As a result the future works of the CFD research were clarified on the hydrodynamic study of finite span hydrofoils.
The calculation of a hydrofoil under a free surface showed the wave-making due to the foil and the lift force decrease due to the free surface.
It was shown that the tip vortex had two cores caused by the two boundary layers on the foil upper and lower surfaces, respectively. The rolling-up to the tip vortex and the tip vortex separation were also calculated.
The calculated cavitation on the foil surface had similar appearance to that of the experiments although the quantitative agreement could not be obtained because of the large difference in the Reynolds numbers.
The measurements showed that the tip vortex had a very small radius of 1% the maximum chord length and a high rotation speed of over 0.6 times the uniform flow velocity. A solution adaptive grid, multi-grid system or some modeling of the tip vortex might be required in addition to the turbulence model, in order to calculate a high Reynolds number flow and argue the tip vortex in detail.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 加藤 洋治他: "有限幅直進翼に発生するキャビテ-ションの差分計算" 日本造船学会論文集. 168. 97-104 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 加藤 洋治: "CFDとの対比による新しい現象の発見" 可視化情報. 11. 20-25 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yamaguchi,H.et al: "A Numerical Study on Mehanism of Vortex Generation Downstream of a Sheet Cavity on a Two-Dimensional Hydrofoil" ASME Cavitation and Multiphase Flow Forum. 109. 27-34 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] SeungーHyun Kwag et al.: "Numerical Simulation of Free Surface Flows around a 3ーD Submerged Hydrofoil by NーS Solver" 日本造船学会論文集. 170. 93-102 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kubota,A.et al.: "A New Modeling of Cavitation Flows : a numerical study of unsteady cavitation on a hydrofoil section" Journal of Fluid Mechanics.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kato, H., et al.: "Finite Difference Calculations of Cavitating Flow around a Finite Span Hydrofoil" J. Soc. Nav. Archi. Jpn.168. 97-104 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kato H.: "Findings of New Phenomena by CFD Flow Visualization" J. Visualization Soc. Jpn.11, No. 40. 20-25 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yamaguchi, H., et al.: "A Numerical Study of Mechanism of Vortex Generation Downstream of a Sheet Cavity on a Two-Dimensional Hydrofoil" ASME Cavitation and Multiphase Flow Forum, ASME FED. 109. 27-34 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kwag, S. H. and Mori, K.: "Numerical Simulation of Free Surface Flows around a 3-D Submerged Hydrofoil by N-S Solver" J. Soc. Nav. Archi. Jpn.170. 93-102 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kubota, A., Kato, H. and Yamaguchi, H.: "A New Modeling of Cavitating Flows : a numerical study of unsteady cavitation on a hydrofoil section" Journal of Fluid Mechanics.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 加藤 洋治: "CFDとの対比による新しい現象の発見" 可視化情報. 11. 20-25 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Yamaguchi,H.et al.: "A Numerical Study on Mechanism of Vortex Generation Downstream of a Sheet Cavity on a TwoーDimensional Hydrofoil" ASME Cavitation and Multiphase Flow Forum. 109. 27-34 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] SeungーHyun Kwag et al.: "Numerical Simulation of Free Surface Flows around a 3ーD Submerged Hydrofoil by NーS Solver" 日本造船学会論文集. 170. 93-102 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Kubota,A.et al.: "A New Modeling of Cavitating Flows:a numerical study of unsteady cavitation on a hydrofoil section" Journal of Fluid Mechanics.

    • Related Report
      1991 Annual Research Report
  • [Publications] 加藤 洋治 他: "有限幅直進翼に発生するキャビテ-ションの差分計算" 日本造船学会論文集. 168. 97-104 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] H.Yamaguchi et al.: "A Numerical Study on Mechanism of Vortex Generation Dounstream of a Sheet Cavity on a TwoーDimensional Hydrofoil" ASME Caritation and Multiphase Flow Forumー1991. (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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