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1988 Fiscal Year Final Research Report Summary

Nonlinear Analysis of Fluid Problem with Free Surface by High-Speed Visual Processing System

Research Project

Project/Area Number 62460168
Research Category

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

Allocation TypeSingle-year Grants
Research Field Building structures/materials
Research InstitutionNagoya University

Principal Investigator

MATSUOKA Osamu  Professor of Nagoya University, 工学部, 教授 (90022988)

Co-Investigator(Kenkyū-buntansha) OHMORI Hiroshi  Research Associate of Nagoya University, 工学部, 助手 (90092387)
KATOH Kenji  Lecturer of Toyota Technical College, 講師 (80043206)
MATSUI Tetsuya  Associate Professor of Nagoya University, 工学部, 助教授 (70023083)
Project Period (FY) 1987 – 1988
KeywordsLiquid Storage / Potential Flow / Nonlinear Sloshing / Free Surface / Sloshing / Swirling / Image Processing / Boundary Integral Method / 境界要素法
Research Abstract

Present report deals with the nonlinear sloshing of the fluid in the storage structures as the nonlinear fluid problem with free surface mentioned in the title of this report. In the theoretical treatment, numerical approaches based on both the variational principle and the integral equation are dealt with, where swirling phenomena investigated as well as usual sloshing phenomena with finite amplitude of the free surface. Experimental insurance by using the shaking table test are carried out, where the cylindrical and the spherical storage model are used and newly introduced High-Speed Visual Processing System has been successfully utilized.
Results obtained by the theoretical and experimental research mentioned above can be summarized as follows. For the nonlinear responses of the fluid in the storages:
1) the nonlinear sloshing responses with finite amplitude can be easily caused by the external excitation with the frequency in the neighborhood of the linear resonance domain and, as the results, the nonlinear effect of the dynamic pressure on the wall of the storage becomes so large that one can not ignore in the structural design of the liquid storage.
2) swirling phenomenon can be described as the nonlinear bifurcational phenomenon between the dynamic component of the sloshing response and that in the durection perpendicular to one of the external excitation. For the digital visual processing system:
1) visual data obtained from the high-speed video system can be vividly digitized by the present image processing unit that such an expensive system with super-high resolution system is not required for the present objective.
2) digitized data obtained by using the grid-projection technique are sufficiently fine for restoration of the original three dimensional data for the deformed free surface.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 松岡理: Proc.38th Jpn Ntnl Cong.Appl.Mech.(1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松井徹哉: 日本建築学会構造系論文報告集. 382. 65-76 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大森博司: 日本建築学会構造系論文報告集. 385. 69-78 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大森博司: 日本建築学会構造系論文報告集. (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大森博司: Proc.38th Jpn Ntnl Cong.Appl.Mech.(1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Osamu,MATSUOKA: "Membrane Solution of THree Dimensional Analysis of Circular Pipe Subjected to Pure Bending and Transverse Force" Proc. 38th Japan National Congress for Applied Mechanics. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tetsuya,MATSUI: "Slow Drift Forces on Moored Vessels in Random Waves (An Exact Second-Order Theory)" Journal of Structural and Construction Engineering (Transactions of AIJ). 382. 65-76 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tetsuya,MATSUI: "Numerical Prediction of Wave-Induced Motion of Floating Bodies by Hybrid Integral-Equation Method" Journal of Structural and Construction Engineering (Transactions of AIJ). 393. 165-176 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi,OHMORI: "On the Sloshing with Finite Amplitude in the Liquid Storages (Part 3: Theoretical Experimental Investigation on the Swirling Phenomenon)" Journal of Structural and Construction Engineering (Transactions of AIJ). 385. 69-78 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi,OHMORI: "On the Sloshing with Finite Amplitude in the Liquid Storages (Part 4:Boundary Integral Approach for the Axisymmetric Storage and Its Application to the Spherical Tanks)" Journal of Structural and Construction Engineering (Transactions of AIJ). (1989)

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

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Published: 1990-03-20  

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