DTIC ADA480924: Physics Based Virtual Fly Outs pdf

DTIC ADA480924: Physics Based Virtual Fly Outs

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This paper describes the development and application of a new multidisciplinary computational capability to compute the flight trajectories and the free flight aerodynamics of projectiles. Advanced computational capabilities both in computational fluid dynamics (CFD) and rigid body dynamics (RBD) have been successfully fully coupled on high performance computing (HPC) platforms for Virtual Fly-Outs of guided munitions identical to actual free flight tests in the aerodynamic experimental facilities. For the first time, this integrated capability now allows time-accurate truly coupled CFD/RBD computations to simultaneously predict the free flight aerodynamics and compute the actual flight trajectories of both spin and fin stabilized projectiles and missiles with and without flight control maneuvers using microjets or control surfaces such as canards. Computed positions and orientations of the projectiles have been compared with actual data measured from free flight tests and are found to be generally in good agreement. Unsteady numerical results obtained from the coupled method show the flow field, the aerodynamic forces and moments, and the flight trajectories of the projectiles.

Computed results obtained for a complex configuration with canard-control pitch-up maneuver in a virtual fly-out show the potential of these techniques for providing the actual timedependent response of the flight vehicle and entire flight trajectory of a complex guided projectile system. It can lead to accurate determination of aerodynamics

• Creator/s: Defense Technical Information Center
• Date: 11/1/2006
• Year: 2006
• Book Topics/Themes: DTIC Archive, Sahu, Jubaraj, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *PROJECTILES, *TRAJECTORIES, *FREE FLIGHT, *AERODYNAMICS, FLIGHT TESTING, FLOW FIELDS, RESPONSE, FIN STABILIZED AMMUNITION, CANARD CONFIGURATIONS, RIGIDITY, SUPERCOMPUTERS, AERODYNAMIC FORCES, FLIGHT, DYNAMICS

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