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On the relationship between the vortex formation process and cylinder wake vortex patterns

Published online by Cambridge University Press:  29 October 2004

DAVID JEON and
MORTEZA GHARIB
DAVID JEON
Affiliation:
Graduate Aeronautical Laboratory, California Institute of Technology, Pasadena, CA 91125, USA
MORTEZA GHARIB
Affiliation:
Graduate Aeronautical Laboratory, California Institute of Technology, Pasadena, CA 91125, USA
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Abstract

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The idea of vortex formation time, originally developed for vortex ring formation, is extended to bluff-body flows. Effects related to characteristic vortex formation time are shown for both the cylinder starting from rest and the cylinder undergoing forced oscillations in a steady flow. By looking at how wake vortices are formed when the cylinder is accelerated from rest, it is found that similarities exist between the formation process for wakes and for vortex rings. This formation process is then observed for forced oscillating cylinders, where the characteristic formation time interacts with the oscillation period. Frequently observed bluff-body phenomena will be recast in light of the vortex formation process.

Information

Type
Papers
Information
Journal of Fluid Mechanics , Volume 519 , 25 November 2004, pp. 161 - 181
Copyright
© 2004 Cambridge University Press