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Published 2005 | Published
Journal Article Open

The Lie-Poisson Structure of the Euler Equations of an Ideal Fluid

Abstract

This paper provides a precise sense in which the time t map for the Euler equations of an ideal fluid in a region in R^n (or a smooth compact n-manifold with boundary) is a Poisson map relative to the Lie-Poisson bracket associated with the group of volume preserving diffeomorphism group. This is interesting and nontrivial because in Eulerian representation, the time t maps need not be C^1 from the Sobolev class H^s to itself (where s > (n=2) + 1). The idea of how this diculty is overcome is to exploit the fact that one does have smoothness in the Lagrangian representation and then carefully perform a Lie-Poisson reduction procedure.

Additional Information

© 2005 International Press. Communicated by Tudor Ratiu, received August 23, 2005. The hardcopy and electronic editions of Dynamics of Partial Differential Equations are protected by the copyright of International Press.

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August 19, 2023
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