关键词: 虚拟飞行, 预估校正, 嵌套网格, 长鳍导弹, 自由摇滚

Abstract: An aerodynamics and flight dynamics coupling computation method and software VFNS were developed. Control equations are unsteady Navier-Stokes equations and rigid body 6-dof flight dynamic equations; Flow solver is a finite-volume solver of structure gird which solve unsteady RANS equations with dual time step and S-A turbulence model. Adams prediction-correction method is used to couple the aerodynamics and flight mechanics computation, and chimera method is used to simulate relative movement. This method is used to simulate the free-to-pitch movement combining rudder deflection for a missile concept with long middle strikes. Simulation results show that the third order Adams prediction-correction method can simulate in a much higher time step while keeps in an equal precision level to obviously decrease simulation time. Finally, VFNS was used to simulate free-to-roll dynamics and longitudinal virtual flight. Simulation results have good agreement with wind tunnel experiments.

Key words: Virtual Flight, Prediction-Correction, Chimera Grid, Strake Missile, Free to Roll