Strong swirl approximation and intensive vortices in the atmosphere

Klimenko, A. Y. (2014) Strong swirl approximation and intensive vortices in the atmosphere. Journal of Fluid Mechanics, 738 268-298. doi:10.1017/jfm.2013.557

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Author Klimenko, A. Y.
Title Strong swirl approximation and intensive vortices in the atmosphere
Journal name Journal of Fluid Mechanics   Check publisher's open access policy
ISSN 0022-1120
1469-7645
Publication date 2014-01
Year available 2013
Sub-type Article (original research)
DOI 10.1017/jfm.2013.557
Open Access Status File (Author Post-print)
Volume 738
Start page 268
End page 298
Total pages 31
Place of publication Cambridge, United Kingdom
Publisher Cambridge University Press
Collection year 2014
Language eng
Abstract This work investigates intensive vortices, which are characterised by the existence of a converging radial flow that significantly intensifies the flow rotation. Evolution and amplification of the vorticity present in the flow play important roles in the formation of the vortex. When rotation in the flow becomes sufficiently strong (this implies the validity of the strong swirl approximation, which has been developed in a series of publications since the 1950s) the previous analysis of the author and the present work determine that further amplification of vorticity is moderated by interactions of vorticity and velocity. This imposes physical constraints on the flow, resulting in the so-called compensating regime, where the radial distribution of the axial vorticity is characterised by the 4/3 and 3/2 power laws. This asymptotic treatment of a strong swirl is based on vorticity equations and involves higher-order terms. This treatment incorporates multi-scale analysis indicating downstream relaxation of the flow to the compensating regime. The present work also investigates and takes into account viscous and transient effects. One of the main points of this work is the applicability of the power laws of the compensating regime to intermediate regions in large atmospheric vortices, such as tropical cyclones and tornadoes.
Keyword Vortex flows
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 5 December 2013.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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