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1996 Fiscal Year Final Research Report Summary

Free Surface Effects on Viscous Hydrodynamic Forces Acting on Offshore Structure

Research Project

Project/Area Number 07455403
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 海洋工学
Research InstitutionKyushu University

Principal Investigator

KOTERAYAMA Wataru  Kyushu Univ.Research Institute for Applied Mechanics Professor, 応用力学研究所, 教授 (80038562)

Co-Investigator(Kenkyū-buntansha) YAMAGUCHI Satoru  Kyushu Univ.Research Institute for Applied Mechanics Research Assistant, 応用力学研究所, 助手 (00253542)
NAKAMURA Masahiko  Kyushu Univ.Research Institute for Applied Mechanics Assictant Professor, 応用力学研究所, 助教授 (40155859)
Project Period (FY) 1995 – 1996
KeywordsViscouse Hydrodynamic Force / Offshore Structre / Free Surface Effects
Research Abstract

We carried out the research project of the free surface effects on the viscous force acting on an off shore structure from July of 1995 to March of 1997. As the basic study for this topics we have carried out following theoretical and experimental studies.
(1) A numerical study on the wave forces acting on a circular cylinder.
(2) An experimental study on the viscous hydrodynamic forces acting ob a inclined circular cylinder.
(3) An theoretical and experimental study on the viscous damping forces for the slow drift oscillation of a horizontal submerged cylinder.
On the basis of these studies two application researches were carried out as follows ;
(4) The field experiment and numerical prediction on dynamics of a floating structure moored in deep ocean.
(5) An theoretical and experimental study on the thruster assisted mooring system controlled by H* controller.
The main conclusions obtained from these researches are as floolws ;
(1) The viscous wave forces obtained using the numerical simulat … More ion method developed in the research shows good agreements with experiments.
(2) The viscous hydrodynamic force acting on an inclined circular cylinder does not depend on the inclined angle when the inclined angle is taken into consideration into the nondimension form.
(3) The slow drift damping force acting on a circular cylinder obtained from two-harmonic oscillation tests coincides with that from forced oscillation tests in waves, but for a rectangular cylinder the latter one is larger than the former.
(4) An estimation technique for the hydrodynamic forces on an offshore structure has been developed in this study, in which the interference effects and Reynolds effects are taken into consideration. Hydrodynamic forces of an offshore structure estimated using the method show good agreements with those obtained from total model tests.
(5) Motions of an offshore structure predicted using the viscous hydrodynamic forces obtained on the basis of this study and linear theory agreed well with those measured in the field test.
(6) The dynamic positioning system based on a mathematical model for motions developed in this study can control the displacement of an offshore structure very accurately. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 星野 邦弘、小寺山 亘: "振動流中の3次元傾斜円柱に働く流体力" 西部造船会会報. 90号. 103-113 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 星野 邦弘、加藤 俊司、小寺山 亘: "浮体式海洋構造物に加わる流体力の推定法に関する実験的研究" 西部造船会会報. 92号. 117-131 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Changhong Hu,W.Koterayama: "Wave Force on Horizontal Cylinders at Low Keulegan-Carpenter and Reynolds Numbers" International Journal of Offshore and Polar Engineering. Vol.6,No.2. 124-130 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nakamura,H.Kajiwara W.Koterayama: "Model Experiments on Thruster Assisted Mooring System Controlled by H∞ Controller" Proc.of 6th International Offshore and Polar Engineering Conference. Vol.2. 464-468 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] W.Koterayama,H.Mizuoka N.Takatsu,T.Ikebuchi: "Field Experiment and Numerical Prediction on Dynamics of a Light Floating Structure Moored in Deep Ocean" Proc.of 7th International Offshore and Polar Engineering Conference. (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hoshino,S.Kato,W.Koterayama: "Estimation Method of Viscous Forces Acting on Floating Structures" Proc.of 7th International Offshore and Polar Engineering Conference. (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hoshino and W.Koterayama: "Hydrodynamic Forces Acting on an Oscillating Inclined Finite-Length Circular Cylinder" Transactions of the West-Japan Society of Naval Architects. No.90. 103-113 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hoshino, S.Kato and W.Koterayama: "An Experimental Study for Estimating Hydrodynamic Forces Acting on a Floating Structure" Transctions of the West-Japan Society of Naval Architects. No.92. 103-113 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Changhong Hu and W.Koterayama: "Wave Force on Horizontal Cylinders at Low Keulegan-Carpenter and Reynolds Numbers" International Journal of Offshore and Polar Engineering. Vol.6, No.2. 124-130 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Nakamura, H.Kajiwara and W.Koterayama: "Model Experiments on Thruster Assisted Mooring System Controlled by H* Controller" Proc.of 6th International Offshore and Polar Engineering Conference. Vol.2. 464-468 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W.Koterayama, H.Mizuoka.N.Takatsu and T.Ikebuchi: "Field Experiment and Numerical Prediction on Dynamics of a Light Floating Structure Moored in Deep Ocean" Proc.of 7th International Offshore and Polar Engineering Conference. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hoshino, S.Kato and W.Koterayama: "Estimation Method of Viscous Acting on Floating Structures" Proc.of 7th International Offshore and Polar Engineering Conference.(1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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