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Pressure-fluctuation measurements on an oscillating circular cylinder

Published online by Cambridge University Press:  19 April 2006

P. W. Bearman  and
I. G. Currie
P. W. Bearman
Affiliation:
Department of Aeronautics, Imperial College, London
The experiments were carried out in the Department of Mechanical Engineering, University of Toronto, Canada.
I. G. Currie
Affiliation:
Department of Mechanical Engineering, University of Toronto, Canada
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Abstract

Measurements are presented of the fluctuating pressure recorded at a point 90° from the mean position of the forward stagnation point on a circular cylinder oscillating in a water flow. The aspect ratio of the cylinder was 9·5 and the turbulence level in the free-stream was 5·5%. The cylinder Reynolds number was 2·4 × 104 and the cylinder was forced to oscillate transverse to the main flow at amplitudes up to 1·33 cylinder diameters. The reduced velocity was varied over the range 3–18 and the experiments spanned the vortex-shedding lock-in range. Measurements of phase difference between pressure and displacement show that the maximum out-of-phase lift force occurs at an amplitude of about half a diameter. Good agreement is found between measurements on forced and freely oscillating cylinders. A simple potential-flow model gives reasonable predictions of the pressure fluctuations at the body frequency and at twice the body frequency at reduced velocities away from lock-in.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 91 , Issue 4 , 27 April 1979 , pp. 661 - 677
Copyright
© 1979 Cambridge University Press

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