Abstract: In this paper the hypersoinc viscous flow over a spiked hemisphere has been simulated numerically. The complex flow features including shock waves,expansion waves,shear layer and vortices have been captured successfully,Meanwhile, the phenomena,such as the bifurcation and mergence of vorticesf secondary separation and so on,have been found.It is shown that the calcu-lated pressure distribution along the body surface and flow pattern are in good agreement with the experiments.

Key words: Navier-Stokes equation, spikes(aerodynamic configurations), numerical flow visualization