PROJECTILE TRAJECTORY SIMULATION USING CFD CODE

摘要

In order to optimise the projectile design with respect to trajectories and impact attitude, ONERA and Giat Industries have developped a coupling methodology for aerodynamics and flight mechanics. Based on a distributed computational architecture, this concept integrates existing empirical, semi-empirical and Computational Fluid Dynamics (CFD) codes which predict the aerodynamic coefficients for the flight mechanics model. This study deals specifically with the use of CFD code for a 155 mm spinning projectile. General purposes and theoretical concepts are presented. The flight mechanics model is based on a six degrees of freedom motion simulation. The CFD code (FLU3M) solves the time dependent form of both Euler and Navier-Stokes equations and takes into account atmospheric conditions and three dimensional motion (translation and rotation). The simulation results are discussed and compared to free flight tests conducted by ETBS.