A THREE-DIMENSIONAL HYBRID GRID GENERATION TECHNIQUE WITH APPLICATION TO BODIES IN RELATIVE MOTION

摘要

A three-dimensional hybrid grid generation technique is described. The method combines structured grids with unstructured triangular or tetrahedral meshes and Cartesian quadtree/octree grids to provide great flexibility in discretizing a domain. The method utilizes as input a set of structured quadrilateral or hexahedral cell grids that may overlap each other and may not completely cover the domain of interest. An advancing front grid generation algorithm is used to trim the structured grids and remove any overlap. The voids in the domain of interest are filled with unstructured triangular or tetrahedral cells. The method is applied to bodies in relative motion such as occurs in the separation of a store from an aircraft. Local grid restructuring is used to accommodate the motion of the bodies.