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

Jeon, David and Gharib, Morteza (2004) On the relationship between the vortex formation process and cylinder wake vortex patterns. Journal of Fluid Mechanics, 519 . pp. 161-181. ISSN 0022-1120. http://resolver.caltech.edu/CaltechAUTHORS:JEOjfm04

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Abstract

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.


Item Type:Article
Additional Information:"Reprinted with the permission of Cambridge University Press." (Received 10 July 2004 and in revised form 12 July 2004) The authors would like to thank the Office of Naval Research (grant numbers N00014-93-1144 and ONR-N00014-94-1-0793) for their generous support, Professors A. Roshko and A. Leonard for helpful discussions and useful advice.
Subject Keywords:IMPULSIVELY STARTED CYLINDER; OSCILLATING CYLINDER; CIRCULAR-CYLINDER; INDUCED VIBRATIONS; RING FORMATION; FLOW; FORCES
Record Number:CaltechAUTHORS:JEOjfm04
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:JEOjfm04
Alternative URL:http://dx.doi.org/10.1017/S0022112004001181
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1819
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:19 Feb 2006
Last Modified:26 Dec 2012 08:46

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