Radiative instability of an anticyclonic vortex in a stratified rotating fluidReport as inadecuate




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* Corresponding author 1 LadHyX - Laboratoire d-hydrodynamique

Abstract : In strongly stratified fluids, an axisymmetric vertical columnar vortex is unstable because of a spontaneous radiation of internal waves. The growth rate of this radiative instability is strongly reduced in the presence of a cyclonic background rotation f-2 and is smaller than the growth rate of the centrifugal instability for anticyclonic rotation, so it is generally expected to affect vortices in geophysical flows only if the Rossby number Ro = 2 Omega-f is large where Omega is the angular velocity of the vortex. However, we show here that an anticyclonic Rankine vortex with low Rossby number in the range -1



Author: Junho Park - Paul Billant -

Source: https://hal.archives-ouvertes.fr/



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