Instabilities and Nonequilibrium Structures pp 141-177 | Cite as
Spatio-Temporal Instabilities in Closed and Open Flows
Abstract
A review is given of the general theory describing the linear evolution of spatio-temporal instability waves in fluid media. According to the character of the impulse response, one can distinguish between absolutely unstable (closed) flows and convectively unstable (open) flows. These notions are then applied to several evolution models of interest in weakly nonlinear stability theory. It is argued that absolutely unstable flows, convectively unstable flows and mixed flows exhibit a very different sensitivity to external perturbations. Implications of these concepts to frequency selection mechanisms in mixed flows and the onset of chaos in convectively unstable flows are also discussed.
Keywords
Shear Layer Lyapunov Exponent Branch Point Convective Instability Absolute InstabilityPreview
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