Calculation of Dynamic Derivatives for High-Speed Vehicles Based on the National Numerical Windtunnel Software

Abstract

Based on the NNW-HyFLOW high-speed numerical simulation software, the forced-oscillation dynamic derivatives module has been constructed using the unsteady implicit method, dual time stepping and rigid rotary grid deformation. The code has been validated by the calculation of Finner, HBS, blunt cone and OV-102 vehicle in the range of Mach number 1.85∼6.85 and angle of attack 0∼20°. Compared with the results from experiments, engineering methods and other software, all predicted dynamic derivatives have the same sign as experimental values, and the overall error is within 15%, which illustrate the effectiveness of the dynamic derivative module. Due to the difference of numerical and experimental environment and error bands of both, the numerical predictions of the damping derivatives and cross-coupling derivatives are consistent with the experimental values, which means that the proposed module has the capacity to calculate dynamic derivatives for complex engineering vehicles.