Hierarchical parameter setting for hybrid grid generation based on the STEP model representation Original Research Article

In this work we present a method for defining parameters for hybrid grid generation in complex geometries. The method is hierarchical and uses the topological information present in the domain model. The latter is based on the STEP ISO boundary representation allowing compatibility with all major CAD systems. The parameter definition permits a detailed control of the grid spacing in the semi-structured part of the grid, while ensuring a smooth spacing variation across the model. Furthermore, arbitrary grid sources can be defined to control the grid size in the unstructured part of the grid if the default size variation is not satisfactory. Finally, an algorithm has been developed to automatically derive many of the grid generation parameters, creating high quality surface grids for complex models with minimum user input.