Parallel Computation of Supersonic Flows Using a Three-Dimensional, Zonal, Navier-Stokes Code.

摘要

A three-dimensional, time marching, Navier-Stokes code has been developed to solve the flow field around complex geometries using a zonal grid frame-work. This report outlines the development of the new code and describes the application of the code to compute the flow field about a blunt-nosed, axisymmetric body shape. The code extends the computational efficiency of MacCormack's explicit method by incorporating a local variable time-stepping scheme and a new smoothing. Additionally, the code incorporates several features to enhance the convergence rate and minimize the size of the computational grid required for accurate solutions. The computational performance achieved through the efficient utilization of the vector and parallel architecture on the Cray 2 and the Cray Y-MP supercomputers is defined. Comparison of the computations with experimental measurements of surface pressure distribution and boundary layer velocity profiles are presented. Keywords: Projectile aerodynamics; Three dimensional flow; Navier-Stokes equations; Zonal grids; Supercomputers. (edc)