风对建筑绕流流动的数值方法

本文利用k-ε湍流模型及SIMPLE方法,在二维条件下,就风对建筑绕流流动进行了数值模拟,建筑及地面的边界条件采用以低Re数k-ε湍流模型中导出的壁函数处理近壁湍流。自由边界采用外推格式。对于计算域中的建筑物则利用控制粘性系数的方法处理。并对计算结果和风洞实验进行了比较。 为了研究建筑物之间的气流及压力分布,本文还对并列两栋建筑的不同情况进行了数值计算和分析。

NUMERICAL SIMULATION OF WIND FLOW AROUND BUILDINGS

In this paper, the authors apply the k-e model of turbulence and SIMPLE method to numerical simulation of the wind flow around buildings under 2-D condition. In the respect of the boundary condition of building and ground, the wall turbulence is analysed with the wall function which is concluded from the k-e turbulence model of Low Re Numbers. the free boundary condition are analysed with the OUTPUSH form. And buildings in the calculation area are analysed with the control viscosity coefficient. The anthors also calculate the velocity field and the pressure field around unit building and compare them with the results of wind tunnel test. The distribution of wind flow and pressure between two side-by-side buildings is also analysed under different conditions.