The geometry and dynamics of interacting rigid bodies and point vortices

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June 2009, 1(2): 223-266. doi: 10.3934/jgm.2009.1.223

The geometry and dynamics of interacting rigid bodies and point vortices

Joris Vankerschaver ^1, , Eva Kanso ^2, and Jerrold E. Marsden ^3,

1.	Control and Dynamical Systems, California Institute of Technology MC 107-81, Pasadena, CA 91125, United States
2.	Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089, United States
3.	Control and Dynamical Systems 107-81, California Institute of Technology, Pasadena, CA 91125, United States

Received November 2008 Revised March 2009 Published July 2009

Abstract
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We derive the equations of motion for a planar rigid body of circular shape moving in a 2D perfect fluid with point vortices using symplectic reduction by stages. After formulating the theory as a mechanical system on a configuration space which is the product of a space of embeddings and the special Euclidian group in two dimensions, we divide out by the particle relabeling symmetry and then by the residual rotational and translational symmetry. The result of the first stage reduction is that the system is described by a non-standard magnetic symplectic form encoding the effects of the fluid, while at the second stage, a careful analysis of the momentum map shows the existence of two equivalent Poisson structures for this problem. For the solid-fluid system, we hence recover the ad hoc Poisson structures calculated by Shashikanth, Marsden, Burdick and Kelly on the one hand, and Borisov, Mamaev, and Ramodanov on the other hand. As a side result, we obtain a convenient expression for the symplectic leaves of the reduced system and we shed further light on the interplay between curvatures and cocycles in the description of the dynamics.

Keywords: point vortices, perfect fluids., Symplectic reduction, Kaluza-Klein.

Mathematics Subject Classification: Primary: 53D20; Secondary: 76M6.

Citation: Joris Vankerschaver, Eva Kanso, Jerrold E. Marsden. The geometry and dynamics of interacting rigid bodies and point vortices. Journal of Geometric Mechanics, 2009, 1 (2) : 223-266. doi: 10.3934/jgm.2009.1.223

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