稳定层结下高层建筑物对污染物弥散影响数值模拟研究

摘要/Abstract

摘要： 采用k-ε高雷诺数湍流模型模拟了稳定层结不同理查森数(Ri_b)下1∶1∶2(长∶宽∶高)高层建筑物对流场结构及污染物扩散的影响。结果表明:温度层结对建筑物周围的流场结构有显著的影响,随着Ri_b增大,建筑物迎风侧静驻点位置逐渐向顶部移动,建筑物顶部回流区逐渐后移,建筑物背风侧回流区的长度先增大后减小,漩涡位置逐渐向建筑物上方移动;建筑物周围的高归一化湍流动能(TKE/u_H²)区域主要分布于建筑物顶部和下风向回流区域,随着Ri_b的增加,建筑物顶部和尾流区内TKE/u_H²减小;随着Ri_b的增大,地面污染物浓度先增大后减小,下风向烟羽高度逐渐减小,烟羽中心浓度最大值的高度上升。

关键词: 数值模拟, 稳定层结, 高层建筑物, 扩散

Abstract: The influence of stable stratification with different Richardson numbers (Ri_b) on the flow structure and pollutant dispersion around a 1∶1∶2 (length∶width∶height) high-rise building using the k-epsilon high Reynolds number turbulence model was simulated. The results show that the temperature stratification significantly affects the flow structure around the building. As Ri_b increases, the leeward stagnation point gradually moves towards the top of the building, the recirculation region on the top of the building shifts backward, and the length of the recirculation region on the windward side of the building first increases and then decreases. The vortex position gradually moves above the building. The high TKE/u_H² region around the building is mainly distributed on the top of the building and in the downwind recirculation region. As Ri_b increases, the TKE/u_H² decreases in the top and wake regions of the building. With increasing Ri_b, the ground-level pollutant concentration first increases and then decreases, the height of the downwind plume gradually decreases, and the maximum concentration in the plume rises.

Key words: numerical simulation, stable stratification, high-rise building, dispersion

中图分类号:

X169

李集勋, 赵金熔, 韩腾校, 郭栋鹏, 杨改强, 张俊芳, 李云鹏, 姚仁太. 稳定层结下高层建筑物对污染物弥散影响数值模拟研究[J]. 辐射防护, 2025, 45(3): 252-265.

LI Jixun. Numerical simulation study on the influence of high-rise buildings on pollutant dispersion under stable stratification[J]. RADIATION PROTECTION, 2025, 45(3): 252-265.

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