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A note on vortex shedding from axisymmetric bluff bodies

Published online by Cambridge University Press:  21 April 2006

Peter A. Monkewitz
Peter A. Monkewitz
Affiliation:
Department of Mechanical, Aerospace and Nuclear Engineering, University of California, Los Angeles, CA 90024, USA
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Abstract

The linear parallel and incompressible stability of a family of axisymmetric wake profiles is studied in the range of Reynolds numbers where helical vortex shedding from bluff bodies of revolution is observed. The family of mean flow profiles allows for the variation of the wake depth as well as for a variable ratio of wake width to mixing-layer thickness. It is found that, even without reverse flow, the first helical mode is absolutely unstable in the near wake for Reynolds numbers, based on wake diameter and free-stream velocity, in excess of 3.3 × 103. A survey of the region of local absolute instability as a function of profile parameters and Reynolds number suggests that the large-scale helical vortex shedding, which is observed between Reynolds numbers of 6000 and 3 × 105 for spheres, may be ‘driven’ by a self-excited oscillation in the near wake.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 192 , July 1988 , pp. 561 - 575
Copyright
© 1988 Cambridge University Press

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