Brunner, Dominik:
ISBN 9783899599183

Fast Boundary Element Methods for Large-Scale Simulations of the Vibro-Acoustic Behavior of Ship-Like Structures. Bericht aus dem Institut für Angewandte und Experimentelle Mechanik 2009/2 # Pb., 214 S., 77 Abb., davon 29 in Farbe, 13 Tab.

SCHLAGWORTE:
Randelementmethoden, schnelle
Fluid-Struktur-Kopplung
Halbraumproblem
Hydroschallabstrahlung
Schiffsdynamik
Schiffsbau

The vibration behavior of ships is noticeably influenced by the surrounding water, which represents a fluid of high density. In this case, the feedback of the fluid pressure onto the structure cannot be neglected and a strong coupling scheme between the fluid domain and the structural domain is necessary. Fast boundary element methods are used to represent the semi-infinite fluid domain, which is favorably modeled by a half-space formulation. This way, Dirichlet boundary conditions on the free water surface are incorporated by a half-space fundamental solution. The fast multipole method is compared with hierarchical matrices for this kind of problem. The ship itself is modeled with the finite element method. Different strong coupling schemes are compared in terms of their efficiency. The convergence behaviour of preconditioned iterative solvers for the coupled system is examined using realistic model problems. Furthermore, the influence of the compressibility of the water is investigated by comparing the solutions of the Helmholtz and the Laplace equation.

	^