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Three-dimensional Instability of the Flow Induced around an Oscillating Cylinder in a Density Stratified Fluid at Rest

Research Project

Project/Area Number 06640528
Research Category

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

Allocation TypeSingle-year Grants
Research Field 物理学一般
Research InstitutionKYUSYU UNIVERSITY

Principal Investigator

TATSUNO Masakazu  Kyushu University, Research Institute for Applied Mechanics, Associate Professor, 応用力学研究所, 助教授 (70038553)

Co-Investigator(Kenkyū-buntansha) KARASUDANI Takashi  Kyushu University, Research Institute for Applied Mechanics, Research Associate, 応用力学研究所, 助手 (30150527)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsStratified Fluid / Oscillating Motion / Non-linearlity / Secondary Flow / Three-dimensional Instability
Research Abstract

The structures of the flow induced by a vertical circular cylinder performing transverse oscillations in a linearly stratified fluid at rest are investigated. The density gradient inhibits the onset of the three-dimensional instability. The instability appears as regularly spaced streaked flows along the cylinder axis. Each streaked flow is shed being oscillated along the cylinder surface. Regularly spaced streaked flows arrange themselves alternately along the cylinder axis as the oscillating motion of a streaked flow is 180゚ out of phase with adjacent streaked flows.
When the non-dimensional amplitude or frequencies are increased beyond critical values, the streaked flows generated alternately along the cylinder axis do not oscillate along the cylinder surface but extend straight in the direction of cylinder oscillation in the same manner as in the homogeneous fluid.

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] 辰野正和: "密度成層流中における振動二次流れ" 第26回流体力学講演会講演集. 225-228 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Tatsuno: "Secondary flow around an oscillating cylinder in a stratified fluid" Proc.26th Fluid Dynamics Conference, Fukuoka. 225-228 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 辰野正和: "密度成層流中における振動二次流れ" 第26回流体力学講演会講演集. 225-228 (1994)

    • Related Report
      1995 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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