Development of a grid generator to support 3-D multizone Navier-Stokes analysis

A three-dimensional grid generation code has been developed to support multizone Navier-Stokes analysis of flowfields associated with complex geometries. The code includes a number of features necessary for this task, including the definition of arbitrary zonal boundary surfaces using the output from a separate surface geometry program. The interior of each zone is gridded by an efficient parabolic/elliptic partial differential equation algorithm. To test the new grid generation code, grids were successfully generated for a finned missile configuration, for a hypersonic vehicle, for a fluid dynamic vortex valve, and for a three-dimensional rocket base/nozzle/plume configuration. Navier-Stokes calculations were run on these grids, with satisfactory results. The new code is expected to provide a solid basis for the extension to optimized and solution-adaptive grid generation in the future.