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A Classification Theorem for Steady Euler Flows (2408.14662v1)
Published 26 Aug 2024 in math.AP
Abstract: Fix a bounded, analytic, and simply connected domain $\Omega\subset\mathbb{R}2.$ We show that all analytic steady states of the Euler equations with stream function $\psi$ are either radial or solve a semi-linear elliptic equation of the form $\Delta \psi = F(\psi)$ with Dirichlet boundary conditions. In particular, if $\Omega$ is not a ball, then there exists a one to one correspondence between analytic steady states of the Euler equations and analytic solutions of equations of the form $\Delta \psi = F(\psi)$ with Dirichlet boundary conditions.