The interaction of an oblique shock wave with a bow shock in front of a hemisphere at Mach 14.6 is simulated. The configuration corresponds to an experiment performed at the Calspan University of Buffalo Research Center (CUBRC). Several simulations are required due to uncertainty in the exact location of the incident oblique shock wave with the criterion to match the location of the computed and experimental peak surface pressure and heat transfer. In our previous paper (Kianvashrad, N. and Knight, D., AIAA Paper No. 2019-0890, SCITECH 2019) two simulations were presented with different incident shock locations. One of the simulations showed statistically stationary (periodic) behavior in the surface pressure and heat transfer, but the location of the computed peak surface pressure and heat transfer differed from experiment by three degrees on the surface of the hemisphere. A second computation with different incident shock location showed close agreement between the locations of the computed and experiment peak surface pressure and heat transfer; however, the computation was not yet statistically stationary. The objectives of this paper are to examine results of the second incident shock location, and to evaluate additional numerical issues associated therein including temporal accuracy and the number of inner iterations used for temporal integration. The careful examination of the results shows a turbulent flow for the second case while the first case is unsteady laminar flow.
展开▼
