The 3D modeling and radar simulation of low-altitude wind shear via computational fluid dynamics method

Abstract

Low-altitude wind shear, which is caused by downward flowing air, is the most dangerous weather phenomenon in the phase of landing or take off. To solve the difficult problem of real data obtainment, a 3D modeling method of low-altitude wind shear via computational fluid dynamics method is proposed in this paper. On the basis of hydrodynamic characteristics of wind shear, the 3D density and velocity field is simulated by using the computational fluid dynamics method. After the preprocessing of the original non uniform wind field data, the radar echo simulation of the low-altitude wind shear is realized, which is accordance with the look-down scanning process of airborne weather radar. Simulation results have shown that the method can realize the 3D wind field modelling of low-altitude wind shear precisely. The wind speed estimation of echo signals can indicates the relationship between the Doppler velocity and distance which has the distribution characteristics of “S” shape.