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The onset and development of circular-cylinder vortex wakes in uniformly accelerating flows

Published online by Cambridge University Press:  26 April 2006

Tim Lee  and
Ralph Budwig
Tim Lee
Affiliation:
Mechanical Engineering Department, University of Idaho, Moscow, ID 83843, USA Current address: Chemical Engineering Department, Johns Hopkins University, Baltimore, MD 21218. USA.
Ralph Budwig
Affiliation:
Mechanical Engineering Department, University of Idaho, Moscow, ID 83843, USA
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Abstract

The influence of uniform flow acceleration on the stability and the characteristics of circular-cylinder wakes over a Reynolds-number range, 20 < R < 330, was investigated. Experiments were performed to examine the temporal evolution of the wake before, during, and after the onset of the wake instability. We have demonstrated in several ways that the wake is stabilized by flow acceleration: (i) the onset of the wake instability occurs at larger Reynolds numbers than in the steady flow case, (ii) the closed wake develops to states that would be unstable in a steady flow, and (iii) once vortex shedding does occur there is a reduction in instantaneous Strouhal number. We have also examined the temporal growth rate of the wake instability and find that it is directly proportional to the applied flow acceleration. Physical mechanisms are proposed to describe the experimental observations.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 232 , November 1991 , pp. 611 - 627
Copyright
© 1991 Cambridge University Press

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