3-DIMENSIONAL FLOW COMPUTATION AROUND A PROJECTILE OVERTAKING A PRECEDING SHOCK-WAVE

A numerical simulation of the flowfield around a projectile overtaking a preceding shock wave is carried out by solving the three-dimensiona l, thin layer Navier-Stokes equations. A domain decomposition method w ith the fortified solution algorithm interface scheme is used to suppl y reasonable grid configurations for such an unsteady flowfield. Compu ted results show that complicated interaction flowfields are observed while overtaking the shock wave. The results of the two- and three-dim ensional flowfield computations are compared, and the characteristic f eatures of the three-dimensional flowfield are shown. Time histories o f the aerodynamic forces show that the projectile suffers strong asymm etric forces while overtaking the shock wave, which may make the traje ctory of the projectile unstable.