Computational and experimental investigation of cavity flowfields

1987 
Introduction T HE definition of cavity flowfields is important for application to cavities on contemporary and future aircraft and missile configurations capable of sustained supersonic flight speeds. A two-dimensional Navier-Stokes analysis utilizing an upwind relaxation scheme was conducted to compute the flows at the half-width symmetry plane of the cavity. The shocks were captured and turbulence was algebraically modeled. Experimental tests were also conducted in the Langley Unitary Plan Wind Tunnel (UPWT) for a box-cavity in a flat plate at zero angle of attack. The computational and experimental results were compared for flows with freestream Mach number, unit Reynolds number, and total temperature of 1.5, 2x 10/ft, and 585 °R, respectively, over cavities with length-to-depth ratios (L/D) of 6, 12, 16. The characteristics of open, closed, and transitional cavities were captured computationally as well as experimentally.
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