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Investigation of the flow between a pair of circular cylinders in the flopping regime

Published online by Cambridge University Press:  21 April 2006

H. J. Kim  and
P. A. Durbin
H. J. Kim
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135. USA Present address: Thermal, Fluid and Aeronautical Engineering Research Lab, Korea Advanced Institute of Science and Technology, P.O. Box 131, Cheongrayang, Seoul, Korea.
P. A. Durbin
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135. USA
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Abstract

The wakes of a pair of circular cylinders are grossly unsteady when the cylinders are separated in a direction normal to the approaching flow by less than one cylinder diameter. The wakes flop randomly between two asymmetric states. The time-scale for the flopping is several orders of magnitude longer than the timescale of vortex shedding, and also several orders of magnitude longer than the timescale for instability of the separating shear layers. When a splitter plate is positioned suitably on the centreline of the cylinders, the flopping can be stopped and the flow made to assume either of the asymmetric states, or a symmetric steady state. For a range of plate positions a new, periodic oscillation occurs. Acoustic excitation can also destroy the flopping mean flow, replacing it by a symmetric flow.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 196 , November 1988 , pp. 431 - 448
Copyright
© 1988 Cambridge University Press

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