The Numerical Simulation Bout Low Level Wind Field Coupled WRF With FLUENT

Low level wind especially low level wind shear,has an important influence on the safety of civil aviation.this paper use FNL and Station information at Lanzhou Airport,using weather analysis and mesoscale numerical model WRF coupled FLUENT,the low-level wind shear events over ZJJJ in February 25,2016 were simulated and analyzed,the conclusions are as follows:(1)In February 25,2016,South Air flight 6965 was affected by low air shear during the decline of runway No.18 at Lanzhou Zhongchuan Airport,causing the aircraft to resume its flight.In the detection point of the 18 runway and the middle section of the runway,the wind speed decreases less than 2 meters per second.In the rapid increase of wind speed,the wind speed of the middle section of the runway is a little earlier,and the convergence of the air flow is obvious.The wind speed decreases rapidly after the airliner is recovered,The maximum wind speed changes at the middle observation point,Up to 4 meters per second.(2)The mesoscale weather forecast model WRF to simulate 0225 ZLLL low level wind shear event.Firstly,through the analysis of the weather situation map to determine the before and after incident weather situation,the results show that: the 200 hpa westerly jet zone t has little relationship with the incident;In the 500 hpa weather situation,there is an obvious subtropical high in the north of the airport,and a trough line in the southwest is approaching.There is a jet area in the north of the airport in the weather situation of 700 hpa and 850 hpa.In the weather situation of sea level pressure,there are high pressure regions in the north and east of the airport.There is also a high pressure area in the southeast.(3)Secondly,the numerical simulation of the 0225 low air wind shear events at ZJJJ was carried out by using the three heavy nesting method by WRF.The numerical simulation results show that before and after the low level wind shear event,the leading wind direction of the airport is southwest wind and south wind,which is consistent with the leading wind direction issued by the airport.The updraft is actually generated at the airfield,and the wind speed change is not obvious.(4)The wind field of the real terrain of ZJJJ was simulated by FLUENT,and the characteristics of low level wind field were successfully simulated: the uplift of terrain to wind and the influence of complex terrain on pressure distribution.The mesoscale weather system coupled with WRF and FLUENT partly reproduces the wind field around the airport,but it still has a big gap compared with the wind field around the real airport.There is a long road in coupling WRF with FLUENT.