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Instability of co-rotating vertical vortices in a stratified fluid

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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Submitted on : Wednesday, July 16, 2014 - 9:31:44 PM
Last modification on : Thursday, March 5, 2020 - 6:29:24 PM

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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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