In the present paper a multigrid technique for three-dimensional perfect gas hypersonic vis-cous ows has been developed, employing a Total Variation Diminishing (TVD) discretization and an upwind correction prolongation, based on a monotonic reconstruction of coarse-grid correction. The methodology has good convergence properties, both for boundary layer ows and complex shock wave-boundary laye...

Two recent numerical studies of hypersonic flows over bodies with concavities revealed problems with convergence to a steady state with an oft-used application of local-time-stepping. Both simulated flows showed a time-like, periodic shedding of vortices in a subsonic domain bounded by supersonic external flow although the simulations, using local-time-stepping, were not time accurate. Simple m...

A low diffusion particle method for simulating compressible low Knudsen number gas flows is modified for application to flows involving nonequilibrium distributions in rotational and vibrational energy modes. This method is closely based on the direct simulation Monte Carlo (DSMC) method, and has been developed for use in a strongly coupled hybrid scheme with DSMC. In simulations employing this...

General and particular solutions, describing evolution of plasma plumes exhausted by electric propulsion are submitted in the paper. A brief description of algorithms developed for computation of spatial plasma properties distributions of plumes in space are also presented. In the paper, the dynamics problem describing evolution of fully ionised stationary hypersonic plasma jet is formulated an...

This paper presents computational results obtained with the direct simulation Monte Carlo DSMC method for several biconic test cases in which shock interactions and ow separation reattachment are key features of the ow Recent ground based experiments have been performed for several biconic con gurations and surface heating rate and pressure measurements have been proposed for code validation st...

The eeects of nite-rate wall catalyticity are evaluated by numerical simulations of hypersonic non-equilibrium ows. Several models derived from speciic gas surface chemical schemes taking into account elementary steps, such as adsorption, surface recombination and desorption, are considered. The models have been incorporated in a mixed nite-element//nite-volume code for reactive viscous ow as s...

The aerodynamics of future hypersonic air-breathing vehicles will be greatly affected by high-enthalpy or “real gas” effects. It is the purpose of a recent NATO Research and Technology Organization study to assess the readiness of computational fluid dynamics to simulate high-enthalpy flows. This paper summarizes the results of this effort through the discussion of four test cases: a transverse...

A modular particle-continuum (MPC) numerical method is used to simulate steady-state hypersonic flows which exhibit local regions of non-equilibrium embedded within mainly continuum flow fields. The MPC method loosely couples direct simulation Monte Carlo (DSMC) and Navier-Stokes (NS) methods which operate in different regions, use different mesh densities, and are updated using different sized...