Zigzag instability of the Karman vortex street in stratified and rotating fluids

Abstract : We investigate the three-dimensional stability of the Karman vortex street in a stratified and rotating fluid by means of an asymptotic theory for long-vertical wavelength and well-separated vortices. It is found that the Karman street with close rows is unstable to the zigzag instability when the fluid is strongly stratified independently of the background rotation. The zigzag instability bends the vortices with almost no internal deformation. The results are in excellent agreement with direct numerical stability analyses and may explain the formation of layers commonly observed in stratified flows.
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Communication dans un congrès
David Dritschel. Iutam Symposium On Turbulence In The Atmosphere And Oceans, Aug 2008, Cambridge, United Kingdom. Springer, 28, pp.197-206, 2010, IUTAM Bookseries. 〈10.1007/978-94-007-0360-5_16〉
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Soumis le : mardi 22 juillet 2014 - 14:47:32
Dernière modification le : jeudi 10 mai 2018 - 02:01:54

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Axel Deloncle, Paul Billant, Jean-Marc Chomaz. Zigzag instability of the Karman vortex street in stratified and rotating fluids. David Dritschel. Iutam Symposium On Turbulence In The Atmosphere And Oceans, Aug 2008, Cambridge, United Kingdom. Springer, 28, pp.197-206, 2010, IUTAM Bookseries. 〈10.1007/978-94-007-0360-5_16〉. 〈hal-01025991〉

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