Three-Dimensional Unstructured Viscous Grids by the Advancing-Layers Method

摘要

A method is presented for generating three-dimensional viscous unstructured grids on complex configurations. The approach stems from a natural extension of the advancing-layers method (ALM) that has been successfully applied to two-dimensional problems in prior work. High-aspect-ratio tetrahedral cells are constructed in viscous dominated flow regions by the ALM, with the remaining isotropic cells generated by the conventional advancing- front method. Relying on a totally unstructured grid-generation strategy, the method benefits from a high degree of flexibility and automation required for generating grids around complex geometries. Sample three-dimensional grids around complex configurations are presented to show the capability of the method.