EXTENSION OF MULTIGRID METHODOLOGY TO SUPERSONIC HYPERSONIC 3-D VISCOUS FLOWS/

A multigrid acceleration technique developed for solving the three-dim ensional Navier-Stokes equations for subsonic/transonic flows has been extended to supersonic/hypersonic flows. An explicit multistage Runge -Kutta type of time-stepping scheme is used as the basic algorithm in conjunction with the multigrid scheme. Solutions have been obtained fo r a blunt conical frustum at Mach 6 to demonstrate the applicability o f the multigrid scheme to high-speed flows. Computations have also bee n performed for a generic High-Speed Civil Transport configuration des igned to cruise at Mach 3. These solutions demonstrate both the effici ency and accuracy of the present scheme for computing high-speed visco us flows over configurations of practical interest.