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Wave-free floating-body forms in shallow water and application to a very large floating structure

Research Project

Project/Area Number 06651085
Research Category

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

Allocation TypeSingle-year Grants
Research Field 海洋工学
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

KYOZUKA Yusaku  Kyushu University, Interdiscip.Grad.School of Eng.Sci., Professor, 大学院・総合理工学研究科, 教授 (80177948)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Masahiko  Kyushu University, Res.Inst.Appl.Mech., Asso.Professor, 応用力学研究所, 助教授 (40155859)
KOTERAYAMA Wataru  Kyushu University, Res.Inst.Appl.Mech., Professor, 応用力学研究所, 教授 (80038562)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
KeywordsWave-Free Body / Wave-Free Singularity / Wave Free / Wave Diffraction / Shallow Water / Boundary Element Method / 波無し浮体形状 / 半潜水式海洋構造物 / 波浪強制力 / 浅海域 / 浮体 / 波特異点
Research Abstract

Some wave-free floating-body forms in heaving oscillation are obtained by using a wave-free singularity of source and vertical dipole combination to generate bulbous-shaped two-and three-dimentional bodies in shallow water. Body forms are obtained by the streamline tracing method at a planned wave frequency, where the body boundary condition of heaving oscillation is satisfied.
Effects of location of the wave-free singularity and water depth on the body-form are studied. Body forms become slender as water depth becomes shallow. Wave exciting forces of obtained bodies are calculated by the singularity distribution method in two-and three-dimentions to verify that they become wave-free at the planned wave-number.
Model experiments were conducted in 2D and 3D wave tanks. Wave exciting forces of obtained wave-free bodies were measured in regular waves. Wave-free frequency estimated by amplitude reaponse function of heaving excitation is almost same as the theory but a little bit higher, which may be attributed to nonlinear effects such as viscosity of water. Finally, some proposal are made to apply such a wave-free body to a very large floating structure (VLFS) of semi-submersible type.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 成合功光: "浅海域の波無し浮体形状と波浪応答" 土木学会西部支部研究発表会講演概要集. 358-359 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] N.Nariai and Y.Kyozuka :"Wave-Force Body Forms in Shallow Water" Proc.Conference of West Japan Soc.of Civil Engineering. 358-359 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 成合功光、経塚雄策: "浅海域の波無し浮体形状と波浪応答" 平成7年度土木学会西部支部研究発表会梗概集. (発表予定). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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