In this contribution, we present our concepts for two decisive components of a partitioned simulation of fluid-structure interactions: The coupling tool and the flow solver. Hereby, the main focus with respect to the coupling tool, called FSIcce, is to achieve a strict separation and, thus, independence of the coupling strategy and the two solvers. This ensures maximal flexibility with respect to the choice or exchange of these components. The flow solvers F3F and Peano are designed with the help of (adaptive) Cartesian grids in combination with space-filling curves such that a maximal storage efficiency both in terms of memory requirements and memory access is reached.