Abstract
This study presents results obtained with the OVERFLOW2 code for three geometries that produce massively separated flowfields: a circular cylinder in crossflow and the Apollo and Crew Exploration Vehicle (CEV) capsules at various angles of attack. For the circular cylinder, a standard test case for massively separated flowfields, both three-dimensional Detached Eddy Simulations (DES) and Unsteady Reynolds Averaged Navier Stokes (URANS) simulations were obtained with emphasis on comparing URANS solutions using the Lag model to the DES solutions. In addition, two-dimensional URANS simulations are compared to three-dimensional DES and URANS. The Apollo and CEV configurations were simulated with only URANS simulations but with several one- and two- equation turbulence models in addition to the Lag model. For the capsule simulations, the Lag model provided more accurate predictions of experimental lift, drag and pressure distributions for subsonic and supersonic flowfields.
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