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arXiv · 0711.4875

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

Sergiy Vasylkevych·Jerrold E. Marsden
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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 difficulty 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.

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Sergiy Vasylkevych, Jerrold E. Marsden. 2007-11-30. The Lie-Poisson Structure of the Euler Equations of an Ideal Fluid. https://arxiv.org/abs/0711.4875

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