Mechanisms for Absolute Instabilities in Uniform and Nonuniform Density Swirling Flows

What is it about?

As swirling flows undergone vortex breakdown are prone to unstable self-excited hydrodynamic oscillations, we show various mechanisms through disturbance energy modes which contribute to such instabilities. The linear stability analysis conducted in this study identifies the role of various model parameters like swirl number, centerline velocity, density ratio, which ultimately dictates the transition boundary between convectively and absolutely unstable flows.

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