Large eddy simulation study of 3D wind field in a complex mountainous area under different boundary conditions  

作　　者：Yan LI Lei YAN Xuhui HE 

机构地区：[1]School of Civil Engineering,Central South University,Changsha,410075,China [2]National Engineering Research Center for High-speed Railway Construction,Changsha,410075,China [3]Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structures,Changsha,410075,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2024年第7期541-556,共16页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：supported by the National Natural Science Foundation of China(Nos.51925808 and 52178516);the Natural Science Foundation of Hunan Province(Nos.2020JJ5745 and 2023JJ20073),China.

摘　　要：Large eddy simulations generally are used to predict 3D wind field characteristics in complex mountainous areas.Certain simulation boundary conditions,such as the height and length of the computational domain or the characteristics of inflow turbulence,can significantly impact the quality of predictions.In this study,we examined these boundary conditions within the context of the mountainous terrain around a long-span cable-stayed bridge using a wind tunnel experiment.Various sizes of computational domains and turbulent incoming wind velocities were used in large eddy simulations.The results show that when the height of the computational domain is five times greater than the height of the terrain model,there is minimal influence from the top wall on the wind field characteristics in this complex mountainous area.Expanding the length of the wake region of the computational domain has negligible effects on the wind fields.Turbulence in the inlet boundary reduces the length of the wake region on a leeward hill with a low slope,but has less impact on the mean wind velocity of steep hills.

关 键 词：Large eddy simulation(LES) Spectral representation method Recycling method High mountainous canyon Wind characteristics Atmospheric boundary layer Computational domain 

分 类 号：TM614[电气工程—电力系统及自动化]