Abstract

A numerical simulation of unsteady supersonic turbulent flow over double cavity is conducted. The self-sustained oscillatory motion within the cavity is obtained by numerically solving the unsteady, compressible, two-dimensional, full Navier-Stokes equations. The length to depth ratios(=L/D) of the two calculated cavity models are one and three, and the freestream Mach number is 1.5. In this study, four combinations of the two cavity models are considered and the influence of the 1st cavity on the 2nd cavity flowfield is studied. For example, phase shift or period change is observed at the 2nd cavity. The numerical schemes used are Roe's finite volume flux difference splitting technique and Matsuno's 6'-Correction iterative method. Turbulence effect is taken into account using the Baldwin-Lomax eddy viscosity model. The results are compared with the experimental data4 in terms of timeaveraged wall pressure and show favorable agreement. v

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