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

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Abstract

We investigate the three-dimensional stability of the Kármán 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 Kármán 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.

Original languageEnglish
Title of host publicationIUTAM Symposium on Turbulence in the Atmosphere and Oceans - Proceedings of the IUTAM Symposium on Turbulence in the Atmosphere and Oceans
PublisherSpringer Verlag
Pages197-206
Number of pages10
ISBN (Print)9789400703599
DOIs
Publication statusPublished - 1 Jan 2010
EventIUTAM Symposium on Turbulence in the Atmosphere and Oceans - Cambridge, United Kingdom
Duration: 8 Dec 200812 Dec 2008

Publication series

NameIUTAM Bookseries
Volume28
ISSN (Print)1875-3507

Conference

ConferenceIUTAM Symposium on Turbulence in the Atmosphere and Oceans
Country/TerritoryUnited Kingdom
CityCambridge
Period8/12/0812/12/08

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