Object-oriented three-dimensional hybrid grid generation

An algorithm is described for the generation of hybrid grids suitable for viscous computations around complex geometries. The de nition of the geometry is given by the ISO standard STEP format. The grid generation is based on a hierarchical approach. The user-speci ed parameters are given on all basic STEP entities and the de nition is consistent across the complete geometry. Semi-structured layers of prismatic cells are generated, starting from the viscous boundaries of the domain. The remaining volume is lled by an unstructured Delaunay algorithm with frontal node creation. Complex models have been successfully gridded, however, more testing is needed