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In the last years, classification societies have announced several specifications regarding the , limitation of the noise level of ships. Accordingly, the prediction of the acoustic signature of cavitating propellers, which are the main source for noise generation, has attracted a lot of interest. For an accurate numerical simulation of the underlying physics, the deformation of the propeller has to be taken into account, which results in a fluid-structure interaction (FSI) problem. In order to utilize different discretization methods for the individual sub-problems, we apply a partitioned solution approach. This makes it possible to use a finite element solver for the structural problem, while a boundary element solver is used for the fluid problem. From the solution of the FSI problem, the acoustic pressure in the far field is obtained using the Ffowcs William-Hawking equation.

Strongly coupled multifield problems arise in various engineering applications. Fluid-structure interaction problems are one of the most prominent examples, especially in maritime applications. Choosing a partitioned solution approach allows to reuse existing software that was specialized to solve the underlying structural and fluid dynamics subproblems. In this work, the general partitioned solution approach is applied to investigate the hydrodynamics around an elastic marine-propeller. The software library comana is used to steer the solution process. It allows to couple a boundary element solver for the fluid subproblem with a finite element solver for the structural subproblem. It is shown that novel convergence acceleration methods ensure a stable and efficient simulation for different coupling algorithms.

Regarding new propeller materials and designs, vibrations and large deformations are becoming increasingly relevant. Therefore, simulation methods need to be developed which take into account the interaction of fluid and structure while retaining a computational effort suitable for the design stage. In the approach presented here, the fluid mechanical subproblem is solved by means of the software panMARE, which is based on the potential theory. The structural-mechanical subproblem is engaged using different structural solvers as well as modelling approaches. Information exchange between the subproblems is managed by the software comana.