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Research of the Calculation Method for the Free Surface Flow around a Ship Hull

Research Project

Project/Area Number 59460130
Research Category

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

Allocation TypeSingle-year Grants
Research Field 船舶抵抗・運動性能・計画
Research InstitutionYOKOHAMA NATIONAL UNIVERSITY

Principal Investigator

MARUO Hajime  Yokohama National University, Professor, 工学部, 教授 (30017842)

Co-Investigator(Kenkyū-buntansha) TAKUSAGAWA Zensuke  Yokohama National University, Assistant, 工学部, 助手 (60017902)
SUZUKI Kazuo  Yokohama National University, Assistant professor, 工学部, 助教授 (80111699)
IKEHATA Mitsuhisa  Yokohama National University, Professor, 工学部, 教授 (10114969)
Project Period (FY) 1984 – 1985
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1985: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1984: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsHydrodynamics / Free surface / Wave / Ship resistance / Slender body theory / Non-linear effect / Boundary element method / 水槽試験 / 境界要素法水槽試験
Research Abstract

This research project consists of three problems:
1) Application of the slender body theory to the free surface flow around a ship hull in steady forward motion.
Preliminary investigation has been carried out until 1983 and the theoretical formulation has been completed, but there still remain problems with respect to the computation method. The present study intends the development of the program for practical computation of the wave pattern, streamlines on the hull surface, pressure distribution and the wave resistance. The analysis is extended to the case of a ship moving with a constant yaw angle. Some test computations have been carried out, but it is found that further improvement is necessary in order to attain a satisfactory accuracy.
2) Numerical solution of the boundary value problem with non-linear free surface conditions for the flow around a ship in steady motion.
Based on the low speed solution as the first approximation, an iterative method is devloped to calculate the solution which satisfies the non-linear boundary condition on the free surface. Computations of the wave profile, pressure distribution on the hull surface and the wave resistance of hull forms expressed by simple equations and a Series 60 model are carried out. Comparison with measured results shows an excellent agreement and the feasibility of this method for the practical application is proved.
3) Analysis of the flow phenomena around the bow of ship models.
Experimental observation of the free surface flow around the bow of models in the towing tank shows the importance of the surface tension effect, by which the free surface configuration and the resistance of the model are seriously influenced. This fact is very important in connection with the correlation between resistance of models and full-scale ships. Theoretical analysis is carried out for the effect of surface tension to the wave pattern and the law of similitude of the resistance.

Report

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

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 丸尾孟: 日本造船学会論文集. 157. 34-46 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] H.Maruo: Proceedings of Fourth International Conference on Numerical Ship Hydrodynamics. 218-233 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 丸尾孟: 日本造船学会論文集. 158. 1-9 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] H.Maruo: Proceedings of Sixteenth Symposium on Naval Hydrodynamics. (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Maruo, H.: "A Numerical Method of Non-linear Solution for Steady Waves around Ships" Journal Of the Society of Naval Architects of Japan. 157. 34-46 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Maruo, H.,: "A Method of Computation for Steady Ship-Waves with Non-linear Free Surface Conditions" Proceedings of Fourth International Conference on Numerical Ship Hydrodynamics. 218-233 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Maruo, H.: "On the Free Surface Flow around a Model Bow" Journal of the Society of Naval Architects of Japan. 158. 1-9 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Maruo, H.,: "Some Discussions on the Free Surface Flow around the Bow" Proceedings of Sixteenth Symposium on Naval Hydrodynamics. (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] H.Maruo: Proceedings of Sixteenth Symposium on Naval Hydrodynamics. (1986)

    • Related Report
      1986 Annual Research Report

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

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