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In this paper we discuss the motion of a beam in interaction with fluids. Weallow the beam to move freely in all coordinate directions. We consider thecase of a beam situated in between two different fluids as well as the casewhere the beam is attached only to one fluid. In both cases the fluid-domain istime changing. The fluid is governed by the incompressible Navier-Stokesequations. The beam is elastic and governed by a hyperbolic partialdifferential equation. In order to allow for large deformations the elasticpotential of the beam is non-quadratic and naturally possesses a non-convexstate space. We derive the existence of weak-solutions up to the point of apotential collision.

Unrestricted deformations of thin elastic structures interacting with fluids