Abstract
It is well known that the incompressible Euler equations can be formulated in a very geometric language. The geometric structures provide very valuable insights into the properties of the solutions. Analogies with the finite-dimensional model of geodesics on a Lie group with left-invariant metric can be very instructive, but it is often difficult to prove analogues of finite-dimensional results in the infinite-dimensional setting of Euler’s equations. In this paper we establish a result in this direction in the simple case of steady-state solutions in two dimensions, under some non-degeneracy assumptions. In particular, we establish, in a non-degenerate situation, a local one-to-one correspondence between steady-states and co-adjoint orbits.
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V.Š. supported in part by NSF grant DMS 0800908.
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Choffrut, A., Šverák, V. Local Structure of The Set of Steady-State Solutions to The 2d Incompressible Euler Equations. Geom. Funct. Anal. 22, 136–201 (2012). https://doi.org/10.1007/s00039-012-0149-8
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DOI: https://doi.org/10.1007/s00039-012-0149-8
Keywords and phrases
- Incompressible Euler
- stationary flows
- groups of diffeomorphisms
- Lie–Poisson reduction
- Nash–Moser inverse function theorem