At present, most components in regular shape can be meshed with high-quality structured grids. However, the generation of structured grids is very difficult for some parts or areas, such as casing treatments or coolant channels, even if multi-block topologies are applied. This problem can be alleviated remarkably if a CFD solver allows using any type of grid topology. The grid may consist of structured or unstructured blocks entirely or even a so-called hybrid structured-unstructured grid topology. The word hybrid implies here a combination of structured and unstructured grids, both of which are used to respectively discretize a portion of the flow domain where appropriate.