engleski

Development of a Generalized Grid Mesh Interface for Turbomachinery simulations with OpenFOAM

This paper presents an implementation of the Generalized Grid Interface (GGI) for OpenFOAM. It is used to couple multiple non-conformal regions into a single contiguous domain at matrix level. The main advantage of the Generalized Grid Interface comes from removing the requirement to adjust the topology of the mesh at the interface between two non-conformal meshes. Instead, a set of weighting factors is evaluated in order to properly balance the flux at the GGI interface. Evaluation of the GGI weighting factors is based on the precise computation of the patch faces intersection on each side of the coupling interface as follows from discretisation. This is complicated due to the different grid resolution of the mesh on each side of the interface. This paper describes the choice and implementation of robust and quick algorithms for computing the GGI weighting factors. Furthermore, for turbomachinery simulations in particular, various derived forms of GGI are used regularly. Cyclic GGI, partial GGI and mixing plane GGI are all variants of the basic GGI interface that are needed for various use cases. Finally, it is very important that the GGI interface can be used for parallel OpenFOAM simulations on clusters of computers ; otherwise, this would impose a severe limit on the size of the problems. This paper will show the current state of development of the Generalized Grid Interface for turbomachinery simulations and steps towards its generalisation and parallelisation.

CFD; OpenFOAM; Generalized Grid Interface; GGI; cyclic GGI; Turbomachinery

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