3-D numerical simulation of the wind field over complex terrains at low altitude

Based on the potential flow theories in fluid dynamics, a 3-D numerical simulation method of the wind field over complex terrains at low-altitude has been developed in this paper, which could consider the characteristics of the airflow over mountain, downburst and smoke-streams. Mountains are simulated by transformed hemispheroids, which could describe the shape of mountains well. It is very simple and has little simulation parameters. Furthermore, airflow over mountain that has been carried out by the simulation of terrains and potential flow theories, could reveal the main features of the wind field affected by terrains. The wind field over Shenzhen airport has been simulated and analyzed by this method. The numerical analysis results indicate that this simulation method is suitable and convenient for engineering use, which could provide a 3-D wind field at low-altitude for flight simulators, and it is also applicable for flight dynamics characteristics analysis of aircrafts.