Simulation of wind gust structure in the atmospheric boundary layer with Lattice Boltzmann Method  

作　　者：CHENG XueLing HU Fei ZENG QingCun 

机构地区：[1]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy ofSciences, Beijing 100029, China

出　　处：《Chinese Science Bulletin》2012年第10期1196-1203,共8页

基　　金：the National Natural Science Foundation of China (40875008);the National Basic Research Program of China (2010CB951804)

摘　　要：Cold fronts occur in northern East Asia during winter and spring.After cold frontal passage,airflow is downward and accompa-nying strong winds fluctuate significantly;this is termed wind gusts.Analysis of observation data shows that wind gust structure has coherent characteristics.This is important for entrainment of spring dust storms into the upper boundary layer,where they are transported great distances.The Lattice Boltzmann Method(LBM) is a computational fluid technique based on the Boltzmann transport equation.The LBM has been used to study complex motion such as turbulence,because it describes motion at the micro level.In this paper,Large eddy simulation is introduced in the LBM,enabling simulation of turbulent flow in the atmospheric boundary layer.The formation and development of wind gusts are simulated,and a coherent structure with a combination of wave and vortex is obtained.This explains the mechanism of soil erosion and sand entrainment by the coherent structure of wind gusts.Cold fronts occur in northern East Asia during winter and spring. After cold frontal passage, airflow is downward and accompanying strong winds fluctuate significantly; this is termed wind gusts. Analysis of observation data shows that wind gust structure has coherent characteristics. This is important for entrainment of spring dust storms into the upper boundary layer, where they are transported great distances. The Lattice Boltzmann Method （LBM） is a computational fluid technique based on the Boltzmann transport equation. The LBM has been used to study complex motion such as turbulence, because it describes motion at the micro level. In this paper, Large eddy simulation is introduced in the LBM, enabling simulation of turbulent flow in the atmospheric boundary layer. The formation and development of wind gusts are simulated, and a coherent structure with a combination of wave and vortex is obtained. This explains the mechanism of soil erosion and sand entrainment by the coherent structure of wind gusts,

关 键 词：格子BOLTZMANN方法 大气边界层 大涡模拟 相干结构 阵风 LBM 观测数据 流体技术 

分 类 号：P425.2[天文地球—大气科学及气象学]