Time-Accurate Numerical Prediction of Free Flight Aerodynamics of a Finned Projectile

Report No. ARL-TR-3603
Authors: Jubaraj Sahu (ARL)
Date/Pages: September 2005; 25 pages
Abstract: This report describes a new multi-disciplinary computational study undertaken to compute the flight trajectories and to simultaneously predict the unsteady free flight aerodynamics of a finned projectile configuration. Actual flight trajectories are computed by an advanced coupled computational fluid dynamics (CFD)-rigid body dynamics technique. An advanced timeaccurate Navier-Stokes computational technique has been used in CFD to compute the unsteady aerodynamics associated with the free flight of the finned projectile at supersonic speeds. Computed positions and orientations of the projectile have been compared with actual data measured from free flight tests and are found to be generally in good agreement. Predicted aerodynamics forces and moments also compare well with the forces and moments used in the six-degree-of-freedom fits of the results of the same tests. Unsteady numerical results obtained from the coupled method show the aerodynamic forces and moments and the flight path of the projectile.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2005