Fluid force acting on circular cylinder of finite length in lock-in condition

Shiki Okamoto, Suguru Jimbo, Taketo Hirose, Kousuke Ootsuka

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


This paper describes the fluid force acting on circular cylinder of finite length in the locking-in region. The experiment was carried out in an N. P. L. blow-down type wind-tunnel with a working section of 500 mm × 500 mm × 2 000 mm at Reynolds number of 1.32 × 104. The cylinder was forced to oscillate sinusoidally in the lift direction. The power spectrum of the fluctuating velocity in the wake behind a circular cylinder was measured to show the locking-in region in the present experiment. The time-mean pressure distribution and fluctuation pressure distribution on the circular cylinder were measured for the displacement in the vibration. Consequently it was found that the mean drag and fluctuating lift increase and become maximum in the locking-in region, while the base pressure in the rear surface (θ = 180°) of the cylinder becomes low and attains minimum.

Original languageEnglish
Pages (from-to)1718-1726
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number7
Publication statusPublished - 2006 Jul


  • Circular Cylinder
  • Displacement
  • Flow Induced Vibration
  • Fluctuating Pressure
  • Fluid Force
  • Forced Vibration
  • Pressure Distribution
  • Vortex

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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