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Dynamics and structure of decaying shallow dipolar vortices

Duran-Matute, Matias and Albagnac, Julie and Kamp, Leon P.J. and Van Heijst, Gert Jan F. Dynamics and structure of decaying shallow dipolar vortices. (2010) Physics of Fluids, 22 (11). ISSN 1070-6631

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Official URL: http://dx.doi.org/10.1063/1.3518468

Abstract

The current work reports on a numerical and experimental study of the evolution of decaying dipolar vortices in a shallow fluid layer. The dynamics and the structure of such vortices are investigated as a function of both their Reynolds number Re and the aspect ratio of vertical and horizontal length scales δ. By quantifying the strength of the secondary motions (vertical motions and nonzero horizontal divergence) with respect to the swirling motions of the primary vortex cores, it was found that the three-dimensionality of a shallow (δ << 1) dipolar vortex only depends on a single parameter: δ²Re. Depending on the value of this parameter, three flow regimes are observed for shallow dipolar vortices: (1) a quasi-two-dimensional regime where the structure of the dipolar vortex remains almost unchanged throughout its lifetime, (2) a transitional regime where the structure presents some three-dimensional characteristics but remains coherent, and (3) a three-dimensional regime where the structure of the dipolar vortex acquires a complicated three-dimensional shape with a persistent spanwise vortex at its front.

Item Type:Article
Additional Information:Thanks to AIP editor. The definitive version is available at http://scitation.aip.org The original PDF can be found at Physics of Fluids website: http://scitation.aip.org/content/aip/journal/pof2/22/11/10.1063/1.3518468
HAL Id:hal-00874729
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Eindhoven University of Technology - TU/e (NETHERLANDS)
Laboratory name:
Funders:
Universite Paul Sabatier Toulouse III
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Deposited By: Julie ALBAGNAC
Deposited On:18 Oct 2013 12:24

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