Based on Reynolds Averaged Navier-NTOKES Equations（RANS） standard k-ε model,the 3D steady flow field of wind with sands around standard high building was numerically simulated with soft Computational Fluid Dynamics.Analysis on the wind flow field distribution around high-rise buildings and the dust trajectories of the flow around buildings the simulation results show that： the windward of building have maximum wind pressure,and the leeward have negative pressure,and the wind and grain of sand flow around the building occurred the separation,shedding,vortex,convergence and so on.The simulation results provide some reference to dust prevention and wind environment improvement of urban buildings.%利用计算流体力学模拟软件FLUENT,选用基于雷诺平均的标准k-ε湍流模型对风沙绕流建筑物的三维定常风流场进行数值模拟,分析建筑物周围风流场的分布情况和沙尘绕流建筑物的运动轨迹。计算结果表明建筑物迎风面受到压力最大,背风面受到负压的影响,风流绕流建筑物发生风流的分离,脱落,涡旋,汇合等现象。模拟结果为沙尘防治和城市建筑风环境的改善提供参考。
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