Computation of Aerodynamic Flows over Bluff Bodies Using an Overset-Grid Approach

In this work, the flow fields associated with two canonical turret geometries, a fully exposed hemisphere on a flat plate and a 50% submerged hemisphere on a flat plate, were simulated using the OVERFLOW 2 flow solver. Both turret geometries utilize a flat-window aperture with an aperture ratio (ratio of the aperture diameter to the turret diameter) of 0.295 and an elevation angle of 57 • . The forward field of regard was the particular focus in this study, and both symmetric (azimuth angle of 0 • ) and asymmetric (azimuth of 45 • ) window orientations were examined. Two flight conditions were also studied; a subsonic case with M = 0.45 and ReD = 6.30 × 10 6 and a transonic case with M = 0.85 and ReD = 9.53 × 10 6 . The flow field was simulated using the Delayed Detached Eddy Simulation capability of OVERFLOW in conjunction with the spatially fifth-order Weighted Essentially Non-Oscillatory (WENO) scheme to capture the off-body vortical structures The incoming boundary layer was set a the same height for both geometries, which corresponded to a quarter of the height of the fully exposed hemisphere and half of the height of the submerged turret. The impact of the turret aerodynamics on the performance of the turrets for directed energy applications is inferred through consideration of the flow features, density and pressure fluctuations, and forces on the turrets.

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Computation of Aerodynamic Flows over Bluff Bodies Using an Overset-Grid Approach

Cited by 3 publications

References 20 publications

Simulation of Various Turrets at Subsonic and Transonic Flight Conditions Using OVERFLOW

Simulation of Various Turrets at Subsonic and Transonic Flight Conditions Using OVERFLOW

Structured Overset Meshing Framework for Fixed-Wing Aircraft Configurations

Simulation of Various Turret Configurations at Subsonic and Transonic Flight Conditions Using OVERFLOW

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