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Researches on Wave Forces Acting on Offshore Structures and Motions in Waves

Research Project

Project/Area Number 60302057
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 InstitutionUniversity of Osaka Prefecture

Principal Investigator

TANAKA Norio  University of Osaka Prefecture, 工学部, 教授 (40081393)

Co-Investigator(Kenkyū-buntansha) HAMAMOTO Yoshimi  Osaka University, 工学部, 教授 (30107130)
IKEDA Yoshiho  University of Osaka Prefecture, 工学部, 講師 (10117989)
OKUNO Taketoshi  University of Osaka Prefecture, 工学部, 講師 (60081395)
Project Period (FY) 1985 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1987: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1986: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1985: ¥4,300,000 (Direct Cost: ¥4,300,000)
KeywordsOffshore structure / Cylinder / Wave Force / KC number / Viscous Force / Irregular oscillation / Semisubmersible / 長周期減衰力 / セミサブリグ / 2次元柱体
Research Abstract

Through studies on wave forces acting on an offshore structure and on response of it in waves following conclusions have been obtained. 1. Drag component of viscous forces acting on an oscillating cylinder is sometimes affected the angle of attack. 2. Viscous forces acting on an oscillating semisubmersible can be predicted by summing up the viscous forces acting on the member cylinders if the angle of attack for the incident flow is taken into account. 3. Steady flow increases the drag coefficient and decreases the added mass coefficient of an oscillating cylinders. This is because increase of the relative velocity of the incident flow and increase of Kc number. 4. Viscous forces acting on an irregularly oscillating cylinder are affected by vortices shedding in previous oscillations as well as vortex shedding in the present swing. 5. Wave forces acting on a cylinder submerged horizontally in regular waves rapidly decreases at very low Kc number. This is because the circulation flow rounding the cylinder due to viscosity. 6. Wave forces acting on a semisubmersible fixed in regular waves decreases at relatively high wave height. 7. A simulation program for non-linear motions of a semisubmergible has been developed. 8. Viscous forces acting on a bluff body starting from rest depend on the displacement of the cylinder from the start. 9. A prediction method of the damping for low frequency oscillation has been derived.

Report

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

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 池田 良穂: 関西造船協会誌. 201. 79-89 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yoshiho Ikeda: Proc. of 6th International Symposium on Offshore Mechanics and Arctic Engineering. 1. 101-107 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yoshiho Ikeda: Proc. of 7th International Conference on Offshore Mechanics and Arctic Engineerfing. 2. 101-108 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 池田 良穂: 日本造船学会論文集. 163. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 池田 良穂: 関西造船協会誌. 210. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yoshiho Ikeda: "Viscous Forces Acting on Oscillating Flat Plate and Circular Cylinder in Steady Flow" Journal of the Kansai Society of Naval Architects, Japan. 201. 79-89 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yoshiho Ikeda: "Viscous Forces Acting on Irregularly Oscillating Circular Cylinders and Flat Plates" Proceedings of 6th International Symposium on Offshore Mechanics and Arctic Engineering. 1. 101-107 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yoshiho Ikeda: "Viscous Forces Acting on A Semisubmersible" Proceedings of 7th International Conference on Offshore Mechanics and Arctic Engineering. 2. 101-108 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yoshiho Ikeda: "Wave Forces Acting on Horozontally Submerged Cylinders in Regular Waves at Low Kc number" Jounal of the Society of Naval Architects of Japan. 163. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yoshiho Ikeda: "Viscous Forces Acting on A Bluff Body Starting from Rest" Journal of the Kansai Society of Naval Architects, Japan. 210. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 池田良穂,野村尚史,田中紀男: 関西造船協会誌. 201. 79-89 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] Yoshiho Ikeda;Kohei Osa;Norio Tanaka: Proc.of 6th International Symposium on Offshore Mechanics and Arctic Engineering. (1987)

    • Related Report
      1986 Annual Research Report

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

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