Stability of a pair of counterrotating and corotating vortices of different strengths

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Title:	Stability of a pair of counterrotating and corotating vortices of different strengths
Authors:	戴璽恆;Dai, Albert;Garía, Marcelo H.;ASCE, M.
Contributors:	淡江大學水資源與環境工程學系
Keywords:	Vortices;Stability;Rotation;Linear analysis
Date:	2009-06
Issue Date:	2010-08-09 20:39:38 (UTC+8)
Publisher:	American Society of Civil Engineers (ASCE)
Abstract:	The stability of a pair of line vortices is considered. The two line vortices are different in strength of circulation and can be counter- or corotating. This work is a generalization reported by Crow in 1970 and Jimenez in 1975. We find that the most unstable wave number and the maximum growth rate of instability are influenced by the circulation difference between the vortices for a pair of counterrotating vortices. For a pair of corotating vortices, we find that their stability properties are not significantly influenced by their circulation difference. Although the physically most-amplified wave number is not apparent based on linear stability analysis, a pair of corotating vortices is unstable irrespective of the circulation difference.
Relation:	Journal of Engineering Mechanics 135(6), pp.591-595
DOI:	10.1061/(ASCE)EM.1943-7889.0000006
Appears in Collections:	[Graduate Institute & Department of Water Resources and Environmental Engineering] Journal Article

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