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The stably stratified Taylor–Couette flow is always unstable except for solid-body rotation
Journal of Fluid Mechanics
The stability of the flow between two concentric cylinders is studied numerically and analytically when the fluid is stably stratified. We show that such flow is unstable when the angular velocity Ω(r) increases along the radial direction, a regime never explored before. The instability is highly non-axisymmetric and involves the resonance of two families of inertia-gravity waves like for the strato-rotational instability. The growth rate is maximum when only the outer cylinder is rotating anddoi:10.1017/jfm.2013.186 fatcat:rcjix4cgvzbolnxq6d23x45c2a