温度层结下建筑物群周围流场影响的数值模拟研究

辐射防护 ›› 2020, Vol. 40 ›› Issue (4): 290-300.

温度层结下建筑物群周围流场影响的数值模拟研究

郭栋鹏¹, 王冉¹, 赵鹏¹, 李云鹏², 姚仁太², 刘瑶³

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

收稿日期:2020-01-19 出版日期:2020-07-20 发布日期:2020-09-21
作者简介:郭栋鹏(1977—),男,2011年毕业于太原理工大学环境工程专业,博士,副教授。E-mail:guodongpeng001@163.com

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

GUO Dongpeng¹, WANG Ran¹, ZHAO Peng¹, LI Yunpeng², YAO Rentai², LIU Yao³

1. Taiyuan University of Science and Technology, Taiyuan 030024;
2.China Institute for RadiationProtection,Taiyuan 030006;
3. Shanxi Environmental Protection Technology Evaluation Center,Taiyuan 030024

Received:2020-01-19 Online:2020-07-20 Published:2020-09-21

摘要/Abstract

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。

关键词: 数值模拟, 稳定度, 建筑物, 流动

Abstract: 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.

Key words: numerical simulation, atmospheric stability, building, flow

中图分类号:

X169

郭栋鹏, 王冉, 赵鹏, 李云鹏, 姚仁太, 刘瑶. 温度层结下建筑物群周围流场影响的数值模拟研究[J]. 辐射防护, 2020, 40(4): 290-300.

GUO Dongpeng, WANG Ran, ZHAO Peng, LI Yunpeng, YAO Rentai, LIU Yao. Numerical simulation study on the effect of thermal stratificationon the flow field around buildings[J]. RADIATION PROTECTION, 2020, 40(4): 290-300.

参考文献

[1] Meroney R N, Cermak J E. Wind tunnel modeling of flow and diffusion over San Nicolas Island[M]. California:Pacific Missile Range,1967.
[2] Uehara, Kiyoshi, Murakami S, et al. Wind tunnel experiments on how thermal stratification affects flow in and above urban street canyons[J]. Atmospheric Environment, 2000, 34(10):1553-1562.
[3] Yassin M F, Kato S, Ooka R, et al. Field and wind-tunnel study of pollutant dispersion in a built-up area under various meteorological conditions[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2005, 93(5):361-382.
[4] Yassin M F. A wind tunnel study on the effect of thermal stability on flow and dispersion of rooftop stack emissions in the near wake of a building[J]. Atmospheric Environment, 2013, 65:89-100.
[5] Yoshihide T, Ted S. Numerical simulation of dispersion around an isolated cubic building: comparison of various types of k-ε models[J]. Atmospheric Environment, 2009, 43(20):3200-3210.
[6] Tominaga Y, Stathopoulos T. CFD simulation of near-field pollutant dispersion in the urban environment: a review of current modeling techniques[J]. Atmospheric Environment, 2013, 79:716-730.
[7] Yoshihide T, Akashi M, Shuzo M, et al. Comparison of various revised k-ε models and les applied to flow around a high-rise building model with 1∶1∶2 shape placed within the surface boundary layer[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2008, 96(4):89-411.
[8] Meroney R N, Leitl B M, Rafailidis S, et al. Wind-tunnel and numerical modeling of flow and dispersion about several building shapes[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1999, 81(1-4):333-345.
[9] ZHANG Y Q, Arya S P, Snyder W H. A comparison of numerical and physical modeling of stable atmospheric flow and dispersion around a cubical building[J]. Atmospheric Environment, 1996, 30(8):1327-1345.
[10] Santos J M, Reis J N C, Goulart E V, et al. Numerical simulation of flow and dispersion around an isolated cubical building: the effect of the atmospheric stratification[J]. Atmospheric Environment, 2009, 43(34):5484-5492.
[11] Ashrafi K, Orkomi A Ah, Motlagh M S. Direct effect of atmospheric turbulence on plume rise in a neutralatmosphere[J]. Atmospheric Pollution Research, 2017, 8:640-651.
[12] Orkomi A Ah, Ashrafi K, Motlagh M S. New plume rise modeling in a turbulent atmosphere via hybrid RANS-LESnumerical simulation [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2018, 173: 132-146.
[13] 蒋维楣, 苗世光. 城市街区污染散布的数值模拟与风洞实验的比较分析[J]. 环境科学学报, 2003, 23:652-656.
JIANG W M, MIAO S G. A comparative analysis of numerical simulation of pollution dispersion in urban blocks and wind tunnel experiments[J]. Journal of Environmental Science, 2003, 23:652-656.
[14] 张宁, 蒋维楣. 建筑物对大气污染物扩散影响的大涡模拟[J]. 大气科学, 2006, (2):212-220.
ZHANG N, JIANG W M. Large eddy simulation of the influence of buildings on the diffusion of atmospheric pollutants[J]. Journal of Atmospheric Science, 2006, (2):212-220.
[15] 郭栋鹏, 姚仁太, 乔清党. 建筑物对污染物扩散影响的数值与风洞模拟研究[J]. 实验流体力学, 2010, 24(6):16-21.
GUO D P, YAO R T, QIAO Q D. Numerical and wind tunnel simulation of the influence of buildings on pollutant diffusion[J]. Experimental Fluid Mechanics, 2010, 24(6):16-21.
[16] 郭栋鹏, 闫函, 姚仁太, 等. 复杂建筑物对近场扩散影响的数值与风洞模拟的比较分析[J]. 实验流体力学, 2013, 27(2):56-62.
GUO D P, YAN H, YAO R T, et al. Comparative analysis of numerical and wind tunnel simulation of the influence of complex buildings on near-field diffusion[J]. Experimental Fluid Mechanics, 2013, 27(2):56-62.
[17] 乔清党, 郭栋鹏, 姚仁太, 等. 建筑物周围流场与污染物扩散的数值与风洞模拟研究[J]. 辐射防护, 2011, 31(4):202-208.
QIAO Q D, GUO D P, YAO R T, et al. Numerical and wind tunnel simulation of flow field and pollutant diffusion around buildings[J]. Radiation Protection, 2011, 31(4):202-208.
[18] OKE T R. Street design and urban canopy layer climate [J]. Energy Building, 1988, 11:103-113.