The movement of a solid in an incompressible perfect fluid as a geodesic flow

Glass, Olivier; Sueur, Franck

doi:10.1090/S0002-9939-2011-11219-X

The movement of a solid in an incompressible perfect fluid as a geodesic flow
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by Olivier Glass and Franck Sueur

Proc. Amer. Math. Soc. 140 (2012), 2155-2168

DOI: https://doi.org/10.1090/S0002-9939-2011-11219-X

Published electronically: October 4, 2011

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Abstract:

The motion of a rigid body immersed in an incompressible perfect fluid which occupies a three-dimensional bounded domain has recently been studied under its PDE formulation. In particular, classical solutions have been shown to exist locally in time. In this paper, following the celebrated result of Arnold concerning the case of a perfect incompressible fluid alone, we prove that these classical solutions are the geodesics of a Riemannian manifold of infinite dimension, in the sense that they are the critical points of an action, which is the integral over time of the total kinetic energy of the fluid-rigid body system.

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