Multiblock Structured Mesh Generation for Turbomachinery Flows

Multiblock structured meshes offer better computational efficiency than the unstructured meshes which, on the other hand, are more flexible for complex geometries. The multiblock structured meshing could be more useful if the partitioning of the domain can be performed automatically. In this paper, we consider various automated blocking approaches for some turbomachinery zones. We then assess these methods by employing adjoint based error estimation which shows that medial axis based methods perform better than the other approaches like Cartesian fitting. A hybrid approach is also demonstrated for the cases where the existing automatic blocking techniques might not be useful. New blocking templates can also be generated using the techniques applied in the work presented here.