Instability of co-rotating vertical vortices in a stratified fluid - École polytechnique Access content directly
Book Sections Fluid Mechanics and its Applications Year : 2006

Instability of co-rotating vertical vortices in a stratified fluid

Pantxika Otheguy
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Paul Billant
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Jean-Marc Chomaz

Abstract

We show numerically, theoretically and experimentally that two co-rotating vertical vortices in a stably stratified fluid are subjected to a new three-dimensional similar to the zigzag instability observed on counter-rotating vortices (Billant & Chomaz, 2000). This zigzag instability induces the formation of thin horizontal layers with a thickness inversely proportional to the Brunt-Väisälä frequency. This three-dimensional instability is believed to make stratified turbulence depart from two-dimensional turbulence since it alters the merging of vortices. © 2006 Springer.

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hal-01023362 , version 1 (16-07-2014)

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Pantxika Otheguy, Paul Billant, Jean-Marc Chomaz. Instability of co-rotating vertical vortices in a stratified fluid. SHIGEO KIDA. IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence Dynamics, 79 (-), Springer, pp.219-224, 2006, Fluid Mechanics and Its Applications, 978-1-4020-4180-8. ⟨10.1007/1-4020-4181-0_25⟩. ⟨hal-01023362⟩
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