Capabilities for Magnus Prediction in Subsonic and Transonic Flight

The Magnus characteristics of three spin-stabilized projectiles were characterized using steady-state RANS and time-accurate RANS/LES computational fluid dynamic simulations. RANS/LES simulations improved the Magnus moment prediction for projectiles with rounded or chamfered bases. No difference was found between the RANS and RANS/LES simulations for the projectile with a sharp-cornered base?either with or without a boattail. The near-body flow field was similar for RANS and RANS/LES simulations; but the RANS/LES simulations resolved the turbulent eddies in the projectile wake. Magnus moment effects were found to be confined to the rear end of the projectile. The effects of projectile base shape on Magnus were characterized, demonstrating that boattail and hemispherical base configurations have the largest effect on Magnus moment. See also ADM002187. Presented at the Army Science Conference (26th), held in Orlando, Florida on 1-4 December 2008. Sponsored in part by DoD High Performance Computing Modernization Program, Aberdeen Proving Ground, MD. The original document contains color images.