Computational Study of Reynolds Number and Angle-of-Attack Effects on a 1303 UCAV Configuration with a High-Order Overset-Grid Algorithm

The flow-field around a “1303” UCAV configuration is computationally simulated using a high-order overset-grid algorithm for a variety of Reynolds numbers and angles of attack. The high-order spatial scheme used here is based on a compact, sixth-order finitedifferencing with a tenth-order, adjustable, Pade-type filter. Turbulence modeling is provided by an implicit large-eddy simulation technique whereby the discriminating filter is used to regularize unresolved scales in the computation. Overset-grid techniques, including high-order interpolation and one-sided operators at hole and computational boundaries, are employed to simplify grid generation and provide a domain decomposition capability for parallel processing. Results are obtained at Reynolds numbers based on the mean aerodynamic chord of Remac = 17927, 29879, and 59758 and at angles of attack of 6 ◦, 12◦, and 15◦. The computations are compared to experimental PIV-data recently obtained at these conditions. Particular focus is placed on the validation of the computational approach by comparing mean stream-wise velocity and span-wise normal vorticity between computation and experiment at a variety of span-wise and stream-wise locations.

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