建筑物附近气流特征及湍流扩散的模拟试验  

The Simulation Experiment on the Flow Feature and Turbulence Dispersion near Building

作　　者：王卫国[1] 徐敏[1] 蒋维楣[1] 

机构地区：[1]南京大学大气科学系

出　　处：《空气动力学学报》1999年第1期87-92,共6页Acta Aerodynamica Sinica

摘　　要：用非静力、能量闭合的大气边界层模式对建筑物附近的气流和湍流特征进行了模拟，为了检验模拟结果，将风场和湍流场输入到扩散模式获得了建筑物附近腔区和尾流区内的污染物浓度分布。结果与同样条件下的风洞测试的结果吻合。本文研究结果表明，在来流风速增大的情况下，建筑物下游的尾流区范围变化不大，而腔区范围增大，湍流运动增强。本文所用方法比采用拟合经验公式描述尾流、腔区的特征更能反映不同建筑物、不同来流的影响。In this paper,the flow and the turbulence near building are simulated using a 3 dimension nonhydrostatic atmospheric boundary layer model with an energy closure scheme (E ε). These results are input to a diffusion model to obtain the distribution of the pollutant concentration in the regions of wake and lee near building.The results obtained from numerical simulation are in agreement with those from wind tunnel experiments.The results also indicate that,with the increment of the wind velocity upstream,the range of wake region is little varied at downwind of building,but the range of lee region is increased and the turbulence is stronger.Using the method in this paper can describle more effectively the wake region and the lee region than using the experimential formula under the condition of different buildings and the upstream velocity.

关 键 词：尾硫区 污染扩散 大气边界层模式 湍流 建筑物 

分 类 号：X16[环境科学与工程—环境科学]