Study of RANS simulation of ABL flow over complex terrains - comparison with LIDAR monitoring at Xiao-Ping-Ding

Abstract eng:
Taipei metropolitan area is geographically located in Taipei Basin and its surrounding mountainous region can stretch to dozens of kilometres far from the basin center. Such complex terrain affects significantly the flow field; therefore, the wind speed profile should be carefully reconsidered. To this aim, the influence of the wide range of complex terrain was examined in this study. Due to the topographical effect and the limitation of wind tunnel scale, CFD is a better alternative to have a fullscale simulation of the wide range of complex terrain. In this study, the mean flow over a complex terrain was simulated to compare with the full scale monitoring. The CFD software FLUENT with RANS equations and realizable k-ε turbulence model were used to simulate the flow field. A LIDAR facility was installed in-site at Xiao-Ping-Ding, which is located in the northern Taipei metropolitan area. After the normalizing by the velocity of an appropriate weather station, the results showed that CFD simulation results are in good agreement with the LIDAR measurements. The study showed that the application of 3D steady RANS approach with the realisable k–ε model can provide a fairly good assessment of the complex mean wind velocity profile in vertical direction.

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