不同入口边界条件对建筑群污染物扩散影响的数值研究

Numerical study on the pollutant diffusion around architecture groups influenced by different inlet boundary

合理的入口边界条件是建筑群污染物浓度正确数值模拟的前提,为分析入口边界对污染物浓度扩散的影响,以谐波合成法理论为基础,通过编制程序实现对商业软件Fluent的二次开发,生成满足目标风场流动特性的脉动入口边界,并用风洞试验数据验证所提方法的正确性,然后将生成的脉动风速和常规的平均风速分别作为大涡模拟的入口边界条件,考虑不同风速大小和风剖面形式的影响后,利用组分输运模型,对建筑群内污染物浓度进行分析,得到不同入口边界条件作用下建筑群污染物浓度的分布规律。

A reasonable inlet boundary condition is the premise of correct simulation on the pollutant concentra-tions in architecture groups.Its accuracy determines the validity of simulation results.In order to analyze the effect on pollutant diffusion of different inflows,this paper analyzed the pollutant concentrations in different wind velocity inflow by using species transport model and large eddy simulation method.Thus,the distribution rule of pollutant concentrations influenced by different inflows around architecture groups has been obtained.In addi-tion,the influence of wind velocity of the inflow on the pollutant concentration has also been summarized.The simulation results are compared with the wind tunnel experimental results.There results are in good agreements, which indicates the validity of the simulation method in this paper.