温度层结下建筑物群周围流场影响的数值模拟研究  

Numerical simulation study on the effect of thermal stratification on the flow field around buildings

作　　者：郭栋鹏[1] 王冉 赵鹏[1] 李云鹏 姚仁太[2] 刘瑶[3] GUO Dongpeng;WANG Ran;ZHAO Peng;LI Yunpeng;YAO Rentai;LIU Yao(Taiyuan University of Science and Technology,Taiyuan 030024;China Institute for Radiation Protection,Taiyuan 030006;Shanxi Environmental Protection Technology Evaluation Center,Taiyuan 030024)

机构地区：[1]太原科技大学,太原030024 [2]中国辐射防护研究院,太原030006 [3]山西省环境保护技术评估中心,太原030024

出　　处：《辐射防护》2020年第4期290-300,共11页Radiation Protection

摘　　要：采用RNG k-ε湍流模型模拟温度层结下建筑物群对流场结构的影响,并用风洞实验结果对模拟结果进行验证分析。结果表明:CFD模拟结果与Yassin风洞实验结果能较好地吻合,稳定层结建筑尾流区范围内速度和湍流动能减小。通过对稳定、中性和不稳定条件下模拟结果的比较分析,确定了温度层结对规则建筑物矩阵中流动的影响。同时,温度层结对矩阵中街谷涡旋强度和纵向速度垂直分布有着显著影响,特别是当大气处于稳定条件时,建筑物对速度的衰减作用较为明显。The RNG k-ε turbulence model was used to simulate the effect of thermal stratification on the flow field around buildings. The simulation results were validated by corresponding wind-tunnel experiment. The results showed that the CFD simulation results were consistent with the Yassin’s wind-tunnel experiment results. It is found that the velocity and turbulent kinetic energy in the building wake is the smaller under the stable stratification. Through the analysis of the simulation results under stable, neutral and unstable stratification, the influence of thermal stratification on the flow in the regular buildings matrix was studied. The results showed that the thermal stratification has a significant effect on the vortex intensity and the vertical distribution of longitudinal velocity in the street canyon. In particular, when the atmosphere is stable stratification, the attenuation effect of the building on the velocity is obvious.

关 键 词：数值模拟 稳定度 建筑物 流动 

分 类 号：X169[环境科学与工程—环境科学]