Generation and extension methods of 3D atmospheric turbulence field

In order to improve the real-time flight simulation fidelity of aircraft through turbulence field, the generation and extension methods of 3D atmospheric turbulence field were put forward.Based on Von Karman model, spatial turbulence field was generated in frequency domain by using Monte Carlo method and transformed back to time domain by using 3D Fourier inverse transform.The conjugate characteristic of Fourier transform was applied to guarantee the realism of turbulence field in time domain.During flight simulation, the integral scale and intensity of turbulence field changed with flight altitude by dimensioning the non-dimensional turbulence field which had been generated in advance.A symmetrical turbulence extension method was presented to make sure that the local field could be effectively extended to wide range and continuous field.Simulation result indicates that turbulence field conforms to Von Karman model before and after symmetrical extension, compared to the generation method based on correlation function matrix, the new algorithms have faster generation speed and less storage space, so they are suitable for real-time flight simulation.