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Viscous Hydroelasticity of Riser for Pumping-Up Deep Ocean Water

Research Project

Project/Area Number 13650975
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

OTSUKA Koji  Osaka Prefecture University, Department of Marine System Engineering, Associate Professor, 工学研究科, 助教授 (90213769)

Co-Investigator(Kenkyū-buntansha) KATAYAMA Toru  Osaka Prefecture University, Department of Marine System Engineering, Research Associate, 工学研究科, 助手 (20305650)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2001: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsDeep ocean water / Riser / Vortex induced vibration / Hydroelasticity / Numerical model / Effect of internal flow / 深層水取水管 / 渦励振動 / 管内流
Research Abstract

The aim of this research is to develop a dynamic analysis method for predicting deep-ocean-water pumping-up risers. Firstly, motion measurements of oscillated flexible pipe models were carried out to investigate conditions when vortex induced vibrations occur. The experimental results suggested that vortex induced vibrations occur at Keulegan-Carpenter number higher than 8, and the transverse motion amplitude becomes very large when the motions of the pipe bottom end form 8-shaped figures. Secondary, a symmetrical vortices model was developed to predict viscous forces acting on riser elements. This method is applicable to irregularly oscillating riser elements at Keulegan-Carpenter number lower than 8. Motion measurements of oscillated flexible pipe models were also carried out to validate a dynamic analysis method using the symmetrical vortices model. The results showed that the developed analysis method can estimate the riser motions in both regularly and irregularly oscillating conditions. Thirdly, effects of internal flow were experimentally and theoretically investigated. The results of motion measurements and the dynamic analyses considering the internal flow effects demonstrated that the horizontal displacement of the pipe with internal flow is larger than that without internal flow due to the reaction force of the intake flow. Finally, a dynamic analysis method considering transverse motions was developed to estimate motions with vortex induced vibrations. This method can simulate 8-shaped motions and motions with three antinodes.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Bando, A., Otsuka, K., Ikeda, Y.: "Estimation of Hydrodynamic Forces on an Irregulary Oscillating Cylinder Using Symmetrical Vortices Model"Proc. of 11th Int. Offshore and Polar Eng. Conf.. Vol.3. 437-443 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 坂東晃功, 松本吉倫, 大塚耕司: "海洋深層水取水管の動的挙動解析"海洋深層水研究. Vol.2,No.1. 29-38 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Bando, A., Otsuka, K. and Ikeda, Y.: "Estimation of Hydrodynamic Forces on an Irregularly Oscillating Cylinder Using Symmetrical Vortices Model"Proc. of 11th Int. Offshore and Polar Eng. Conf.. Vol.3. 437-443 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Bando, A., Matsumoto, Y. and Otsuka, K.: "Dynamic Responses of Riser for Pumping-Up Deep Ocean Water"Deep Ocean Water Research. Vol.2, No.1. 29-38 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Bando, A., Otsuka, K., Ikeda, Y.: "Estimation of Hydrodynamic Forces on an Irregularly Oscillating Cylinder Using Symmetrical Vortices Model"Proc. of 11th Int. Offshore and Polar Eng. Conf.. Vol.3. 437-443 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] 板東晃功, 松本吉倫, 大塚耕司: "海洋深層水取水管の動的挙動解析"海洋深層水研究. Vol.2,No.1. 29-38 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] A.Bando, K.Otsuka, Y.Ikeda: "Estimation of Hydrodynamic Forces on Irregularly Oscillation Cylinder Using Symmetrical Vortices Model"Proc. of 11th Offshore and Polar Eng. Conf.. Vol.3. 437-443 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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