The flux-coordinate independent (FCI) approach has become a prominent approach to model plasma edge turbulence of tokamaks in diverted magnetic configurations. However, for a comprehensive description, coupling to a core turbulence model is necessary. Designed for closed magnetic field line configurations, these codes are usually based on a field-aligned description. The coupling of the different geometric descriptions raises new questions and challenges. This work explores the coupling of these configurations in a black box fashion using the preCICE library. To analyse geometric aspects of coupling a diffusion equation on a circular geometry is considered as model problem. A coupling between a edge region simulated by a Cartesian grid and a core region simulated by a polar coordinate grid is constructed and verified. Various data mapping methods of the coupling are analysed. Coupling over realistic diverted geometries is also discussed.

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