2007
DOI: 10.1017/s0022112007008671
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The physics of vortex merger and the effects of ambient stable stratification

Abstract: The merging of a pair of symmetric, horizontally oriented vortices in unstratified and stably stratified viscous fluid is investigated. Two-dimensional numerical simulations are performed for a range of flow conditions. The merging process is resolved into four phases of development and key underlying physics are identified. In particular, the deformation of the vortices, explained in terms of the interaction of vorticity gradient, ∇ω, and rate of strain, S, leads to a tilt in ω contours in the vicinity of the… Show more

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Cited by 30 publications
(83 citation statements)
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“…It also has practical significance, e.g., in the nearfield wake dynamics of an aircraft. Yet despite its elementary nature, the physical mechanisms of two-dimensional vortex merger have not been fully resolved [1,2,12].…”
Section: Introductionmentioning
confidence: 99%
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“…It also has practical significance, e.g., in the nearfield wake dynamics of an aircraft. Yet despite its elementary nature, the physical mechanisms of two-dimensional vortex merger have not been fully resolved [1,2,12].…”
Section: Introductionmentioning
confidence: 99%
“…The determination of (a/b) cr has been the focus of a number of studies, e.g., [11,10,9]. The physical mechanisms of symmetric merger have also been considered, e.g., [7,8,4,13,1,2]. In the more general interaction of two unequal size and/or strength (asymmetric) vortices, there is a greater range of flow behavior and the interaction may result in the destruction of the smaller/weaker vortex.…”
Section: Introductionmentioning
confidence: 99%
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“…The study follows from our previous work on equal vortices [2] identifying the primary physical mechanisms associated with vortex merging and develops a more generalized description and criterion for asymmetric merger. …”
Section: Introductionmentioning
confidence: 99%