Interference flows past cylinder-fin-sting-cavity assemblies

A computer code, VISCC, is developed to solve the three-dimensional, Reynolds-aver aged, unsteady, compressible, and complete Navier-Stokes equations. The equations are solved by an implicit, fully vectorized, finite-volume, upwind-biased, approximately factored, and multigrid method. A hybrid domain decomposition method is developed to utilize the combined advantages of overlapped grids, zonal grids, and block-structured grids. An algebraic turbulence model is developed to represent the Reynolds stresses. The store considered here for simulation is a missile configuration with four tail fins and an L-shaped offset sting. The missile is placed first directly above the opening of a rectangular box cavity, then submerged completely inside the cavity. These two cases represent two distinct and important interference characteristics for an internal store carriage and a subsequent separation. The freestream Mach and the unit Reynolds numbers are 2.75 and 2.97 million per foot, respectively. The results of the time-accurate computations depict these complex flows and help understanding the interference effects between the store and the cavity. These effects are more pronounced when the store is placed inside the parent body. The time-averaged surface pressures compare well with the wind-tunnel data.