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

Conference paper
Part of the IUTAM Bookseries book series (IUTAMBOOK, volume 28)

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.

Keywords

Froude Number Asymptotic Theory Vortex Pair Vortex Street Rossby Number 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Hydrodynamics Laboratory (LadHyX)Ecole PolytechniquePalaiseau CedexFrance

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