建筑间距对大气流动及输移特性影响的模拟研究

采用修正的k-ε湍流模型对不同建筑间距情况下的大气流场、污染物浓度场进行模拟研究。模拟研究结果表明,气流遇到建筑物发生绕流,风速为3m/s的气流在建筑物附近的最大抬升速度达到1.98m/s,气流绕过建筑物后湍动能增强,建筑物后污染物的扩散区域变大;建筑物的布局对气流流动和污染物浓度分布有着很大影响,在不同建筑间距情况下,建筑物尾流区的流场形态有着明显的不同,尾流区内污染物的分布也存在差别。研究结果对认识多个建筑物附近的气流和污染物分布有重要意义。

Numerical Simulation for Atmospheric Flow Filed and Pollutant Concentration Field in Different Spaces between Buildings

Atmospheric flow field and pollutant concentration field were simulated by using the modified k-ε turbulent model on the condition of different spaces between buildings. Simulation results showed that airflow was around buildings,with maximum speed of uplift up to 1.98m/s around the building when the speed of air flow of 3m/s. Turbulent kinetic energy were enhanced after buildings,and distribution region of pollutant was becoming larger. Air flow and distribution of pollutant concentration were affected by building layout. Characteristics of tail flow were obvious different on condition of various spaces between buildings,and the distribution of pollutant concentration was also different in tail flow region. Numerical simulation results have some guidance significance to study the distribution of air flow and pollutant behind the buildings.