WRF-CFD Coupled Modeling Terrain-Induced Turbulence over Orchid Island

Abstract

In aviation safety history the wind shear and clear turbulence are always the hazards in flight safety In some cases turbulences contain little moisture Therefore the Doppler radars are difficult to detect In viewing of the advantage of using CFD method this research focuses on wind shear or turbulence caused by airflow over the complex terrain Furthermore taking the accident of NA-706 as an example to explore the turbulence near Lanyu airport in the season which prevailed the north-east monsoon In this work first metrological simulation using WRF was performed to provide the data for CFD boundary condition By utilizing BPI (Block Polynomial Interpolation) method to couple WRF to FLUENT the results by CFD simulation was capable of providing more flow features near the terrain than merely utilizing uniform flow log-law wind profile or other methods With the CFD simulation results the research efforts were orientated to study the following three subjects First confirming the wind velocity variation and its influence on the flight route of NA-706 Second identifying the intensity of wind shear which caused by the terrain of the Orchid island by several criteria Finally discussing of the potential hazard of the turbulent eddies location which might be produced in the season of north-east monsoon that has impacted on civil aviation flight route at Lanyu airport

Date of Award	2020
Original language	English
Supervisor	Jiun-Jih Miau (Supervisor)