Research on Wind Flow Regulation Influenced by the Mountain Terrain at Large Aperture and High Precision Radio Telescope Site Based on Numerical Simulation

Optimizing the wind environment at the site is important to improve the effective observation time of large-aperture and high-precision radio telescopes in the middle and high frequency bands. Through wind barrier regulating wind flow that can effectively reduce the impact of wind load on the telescope, the layout design of wind barriers is not only related to the height, porosity and other parameters of wind barriers, but also consider the impact of the terrain on wind shield. However, there are few researches on this area. Taking the QiTai radio Telescope (QTT) site as the research object, the influence of different terrains on regulating wind flow is carried out based on numerical simulation. The simulation result shows that the wind speed at the telescope location without wind barriers is mainly related to the highest elevation of the upstream and downstream boundary terrain. Under the condition with wind barriers, if the telescope is located in horizontal terrain, the magnitude of reducing wind speed in the shelter area is related to the wind attack angle of the upstream incoming wind and the elevation of the downstream terrain. The actual slope terrain of the site increases the complexity of the wind flow, and when doing wind flow simulation for wind barriers, the upstream boundary should be extended to the outside of the relatively high mountain as far as possible. The simulation result of different boundary terrains show that the difference of reducing wind speed coefficient at telescope position reaches a maximum of 6%. This study can provide a reliable reference for terrain modeling of regulating wind flow simulation.