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Forçage stochastique du tourbillon de Lamb-Oseen

Fontane, Jérôme and Brancher, Pierre and Fabre, David Forçage stochastique du tourbillon de Lamb-Oseen. (2007) In: CFM 2007 : 18ème Congrès Français de Mécanique, 27-31 Août 2007, Grenoble, France .

(Document in French)

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Official URL: http://hdl.handle.net/2042/16719


We analyse the dynamics of the Lamb-Oseen vortex when continuously excited by a stochastic forcing. This maintained forcing can thus model any perturbation such as variations of atmospheric conditions or turbulence generated by aircraft wings. The mechanisms of transient growth identified by Antkowiak & Brancher (2004, 2007) are retrieved thanks to this approach. In the axisymmetric case, vortex rings appear at the vortex outskirts via an "anti-lift-up" mechanism. For the other azimuthal wavenumbers, the distribution that emerges at large times is a structure which has been excited by left-handed spiraling vorticity sheets. This response corresponds most often to a Kelvin wave. In the helical case, this analysis enables to propose a good candidate for the vortex meandering phenomenon evidenced by experimentalists.

Item Type:Conference or Workshop Item (Paper)
Additional Information:18ème Congrès Français de Mécanique, Grenoble, août 2007, CD-ROM, N°CFM2007-0937
Audience (conference):National conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
European Community
Deposited On:13 Feb 2013 14:52

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