Abstract
We give sufficient conditions for asymptotic stability of a stationary solution to a flowing problem of a homogeneous incompressible fluid through a given planar domain. We consider a planar problem for the Euler equation and boundary conditions for the curl and the normal component of the velocity; moreover, the latter is given on the whole boundary of the flow domain and the curl is given only on the inlet part of the boundary. We establish asymptotic stability of a stationary flow (in linear approximation), assuming it to have no rest points and to satisfy some smallness condition which means that the perturbations leave the flow domain before they become to affect the main flow. In particular, we prove asymptotic stability for an arbitrary stationary flow in a rectangular canal close to the Couette flow without rest points. Moreover, we show that stability of the main flow in the L 2-norm under curl perturbations implies its stability in higher-order norms depending, for example, on the derivatives of the curl.
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Morgulis, A.B., Yudovich, V.I. Asymptotic Stability of a Stationary Flowing Regime of an Ideal Incompressible Fluid. Siberian Mathematical Journal 43, 674–688 (2002). https://doi.org/10.1023/A:1016376319707
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DOI: https://doi.org/10.1023/A:1016376319707