An implicit partitioned arbitrary LagrangianEulerian approach for fluid-structure interaction computations is considered. Enhancements of the coupled solution procedure by nonlinear multigrid techniques, an adaptive underrelaxation, and proper grid movement techniques are investigated.

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In this paper, we present results of the second phase of the project ExaFSA within the priority program SPP1648-Software for Exascale Computing. Our task was to establish a simulation environment consisting of specialized highly efficient and scalable solvers for the involved physical aspects with a particular focus on the computationally challenging simulation of turbulent flow and propagation of the induced acoustic perturbations. These solvers are then coupled in a modular, robust, numerically efficient and fully parallel way, via the open source coupling library preCICE. Whereas we made a first proof of concept for a three-field simulation (elastic structure, surrounding turbulent acoustic flow in the near-field, and pure acoustic wave propagation in the far-field) in the first phase, we removed several scalability limits in the second phase. In particular, we present new contributions to (a) the initialization of communication between processes of

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