Hybrid grid generation for turbomachinery and aerospace applications

A hybrid prismatic=tetrahedral grid generation method is described and applied to complex turbomachinery and aerospace geometries. The high aspect ratio prismatic cells cover the region close to each bodyʹs surface for good resolution of viscous gradients, while tetrahedra tessellate the rest of the domain. The work introduces the concepts of multi-zone mesh generation and local variation of the number of prismatic layers (unstructured prism generation). Both these ideas are aimed to allow di erent levels of grid resolution within the same geometry and to treat disparate geometric length scales. The grid generator is tested with various complex geometries and the resulting hybrid meshes are presented. The applicability of the hybrid grid generator over the wide range of geometries with minimal user interaction demonstrates the robustness and universality of the method. The validity of the generated grids is tested via turbulent ow simulations