Projectile Aerodynamic Coefficient Estimation Using Integrated CFD/RBD and Flight Control System Modeling

Jenna Stahl, Mark Costello, Jubaraj Sahu
2009 AIAA Atmospheric Flight Mechanics Conference   unpublished
A method to efficiently generate a complete aerodynamic description for projectile flight dynamic modeling is described. At the core of the method is an unsteady, time accurate computational fluid dynamics simulation that is tightly coupled to a rigid projectile flight dynamic simulation. This coupled multidisciplinary technique allows "virtual fly-out" of projectiles on supercomputers, predicts the fight path and all the associated unsteady freeflight aerodynamics of a projectile in an
more » ... ctile in an integrated manner, and offers a new approach for generating a complete aerodynamic description consisting of both static and dynamic aerodynamic coefficients. Simulated projectile motion is computed and employed as baseline data at a Mach number of particular interest. For this simulated motion, aerodynamic forces and moments and the full rigid body state vector of the projectile are known. With time synchronized air loads and state vector information, aerodynamic coefficients are estimated using the Output Error Method. This integrated technique is exercised on an exemplar projectile, showing viability of the coupled CFD/RBD simulation in conjunction with the Output Error Method for aerodynamic coefficient estimation. 2 C LP = Roll damping aerodynamic coefficient. C LDD = Fin cant aerodynamic coefficient. C MQ = Pitch damping moment aerodynamic coefficient.
doi:10.2514/6.2009-5715 fatcat:cz7e6pxrxjcddlcwbvxmikjoh4