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Structure of turbulent air flow over wavy surface

Research Project

Project/Area Number 60460049
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 気象・海洋・陸水学
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

MITSUYASU Hisashi  Professor of Kyushu University, 応用力学研究所, 教授 (30038533)

Co-Investigator(Kenkyū-buntansha) MASUDA Akira  Research Associate of Kyushu University, 応用力学研究所, 助手 (60091401)
KUSABA Tadao  Research Associate of Kyushu University, 応用力学研究所, 助手 (00037871)
Project Period (FY) 1985 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 1987: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1986: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1985: ¥3,700,000 (Direct Cost: ¥3,700,000)
KeywordsTurbulence / Structure of air flow over wavy surface / Ind-wave interaction / wind-tunnel experiment / 波面の遮断係数 / 乱流 / 波面上の気流の構造 / 波面と気流の相互作用
Research Abstract

A series of laboratory experiments has been made on the structure of turbulent air flow over solid wavy surfaces to clarify the growth mechanism of wind waves. Important results of the experiments are summerized as follows;
1. Outer boundary of the organized motion of the turbulent air flow over wavy surface is not much different from that over flat surface.
2. Although vertical velocity profile over wavy surface depends on the phase of the waves, the profile averaged over one wave length shows a logarithmic distribution.
3. Wave-induced velocity fluctuations U^^~,W^^~ decreases vertically as exp(-kz).
4. The pressure drag of the Stokes wave surface is larger than that of a sinusoidal wave surface. The increase is mainly due to the increase of phase shift rather than the increase in the pressure magnitude.
5. If we define the sheltering coefficient of the wavy surfaces as the ratio of the pressure drag coefficient to the square of the maximum slope of the wavy surface, it can be uniguely expressed as a function of the Reynolds number.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 坂東利幸, 光易恒: 1986年度日本海洋学会秋季大会講演要旨集. 215-216 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 坂東利幸, 光易恒: 1987年度日本海洋学会秋季大会講演要旨集. 81-82 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 坂東利幸, 光易恒, 丸林賢次, 石橋道芳, 草場忠夫, 増田章: 九州大学応用力学研究所所報. 65. 79-93 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Bando, T.;Mitsuyasu H.: Report Res. lnst. Apppl. Mech.34. 53-65 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Bandou,T. and Mitsuyasu, H.: "An experimental study on the structure of turbulent air flow over wavy surface, 1." Extended Abstract, 1986 Annual Meeting of the Oceanographical Society of Japan (in Japanese).215-216 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Bandou,T. and Mitsuyasu, H.: "An experimental study on the structure of turbulent" Extended Abstract, 1987 Annual Meeting of the Oceanographical Society of Japan (in Japanese).81-82 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Bandou, T., Mitsuyasu, H., Marubayashi, K., Ishibashi, M., Kusaba, T. and Masuda, A.: "The Structure of turbulent air flow over wavy surface" Bulletin of the Research Inst. Appl. Mech., Kyushu Univ. (in Japanese).65. 79-93 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Bandou, T. and Mitsuyasu, H.: "The structure of turbulent air flow over wavy wall, Part 1." Report Research Inst. App. Mech., Kyushu Univ.34. 53-65 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 光易恒,丸林賢次,板東利幸,草場忠夫: 応用力学研究所・所報. 65. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 光易恒,草場忠夫,板東利幸,増田章: 応用力学研究所欧文報告. 103. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 光易恒,板東利幸,草場忠夫,増田章: 応用力学研究所所報. 65. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 板東利幸,光易恒: 1986年度日本海洋学会秋季大会講演要旨集. 215-216 (1986)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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