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| Yim, Eunok; Billant, Paul; Menesguen, Claire. |
| This paper investigates the stability of an axisymmetric pancake vortex with Gaussian angular velocity in radial and vertical directions in a continuously stratified-rotating fluid. The different instabilities are determined as a function of the Rossby number Ro, Froude number Fh, Reynolds number Re and aspect ratio α. Centrifugal instability is not significantly different from the case of a columnar vortex due to its short-wavelength nature: it is dominant when the absolute Rossby number |Ro| is large and is stabilized for small and moderate |Ro| when the generalized Rayleigh discriminant is positive everywhere. The Gent–McWilliams instability, also known as internal instability, is then dominant for the azimuthal wavenumber m=1 when the Burger number... |
| Tipo: Text |
Palavras-chave: Geophysical and geological flows; Vortex flows; Vortex instability. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00347/45817/46635.pdf |
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