On Efficiency of an Unstructured Grid Generation Method for Aerospace Applications

A procedure is presented for efficient generation of high-quality inviscid and viscous unstructured grids applicable to aerospace flow simulations. the method uses an iterative point creation and insertion scheme. points are created using advancing-front/layer type point placement and the connectivity for these generated points are obtained by directly subdividing the elements, which contain them without regard to the quality. this connectivity is then improved by iterative local reconnection subject to a quality criterion. different point placement schemes are used together with two quality criierions, delaunay incircle and min-max, the latter generating better quality grids. results showed that special care must be taken in the generation of initial grid, particularlywhen the distribution of spacing is based on the spacing of the boundary edges. computational results are also presented for a laminar flow around hyperbola nose using viscous grid generated with the present method.