Effect of geometry on the unsteady type IV shock interaction

This work describes the effect of cowl geometry on the unsteady behavior of a type-IV shock interaction. The numerical procedure used for the thin-layer approximation to the compressible Navier› Stokes calculations is a second-order central difference approximation for the diffusion terms and a total variation diminishing type scheme for the inviscid terms. The calculations show that the peak surface pressure, the impingement location of the supersonic jet, and the time required for the development of the interaction are functions of both the impinging shock location and the cowl geometry. In addition, it is shown that the peak pressure loads associated with the type-IV shock interaction can be reduced by changing the geometric shape of the cowl.