行列式街区风场和污染物浓度场分布特征

doi:10.3969/j.issn.1673-503X.2017.05.008

Abstract

Abstract: In order to study the characteristics of wind field and pollutant transportation in a block,the wind field and pollutant concentration were simulated based on the computational fluid dynamics (CFD) software FLUENT using the RNG κ-ε turbulence model.A non-isolated three-dimensional (3-D) parallel block with a linear pollution source in the center of the street was taken as the research object,which was close to the real.The numerical scheme was validated by a wind-tunnel experiment,and then the distribution characteristics of flow field and pollutant concentration in the inner and downstream areas of the 3-D block on a micro scale were analyzed and demonstrated.The results show that the blocking effect of building group results in vortex area with low wind speed in the downwind direction and leads to high loads of pollutants from the inner block.The area of maximum wind speed exists nearby the entrances of two main roads due to the narrow tunnel effect,corresponding to the lowest pollutant concentration.A clockwise-rotated vortex appears in the street canyon with a ratio of height to width of 1:1,and pollutants mostly accumulates in the bottom of leeward,which is consistent with previous studies.The diffusion of pollutants is closely related to turbulence intensity and wind speed.Low pollutant concentration usually appears at the windward with intense turbulence and strong wind speed,while high pollutant concentration exists at the leeward.This work can provide a scientific basis for the city planning and alleviate the air pollution in populated urban areas using natural wind.

Key words: Computational Fluid Dynamics (CFD), Parallel block, Wind tunnel experiment, Flow field, Pollutant concentration

CLC Number:

X169

ZHAN Long-fei, SHU Jiong, CHEN Liang. Distribution characteristics of wind and pollutant concentration fields in a parallel urban block[J]. Journal of Meteorology and Environment, 2017, 33(5): 61-67.

0
/ / Recommend

Add to citation manager EndNote|Reference Manager|ProCite|BibTeX|RefWorks

URL: http://www.jme1984.net.cn/EN/10.3969/j.issn.1673-503X.2017.05.008

http://www.jme1984.net.cn/EN/Y2017/V33/I5/61

References

[1] 周淑贞,束炯.城市气候学[M].北京:气象出版社,1994.
[2] 陈义胜,庞赟佶,闫永旺.建筑物对称性对大气输移特性影响的模拟研究[J].气象与环境学报,2008,24(2):58-61.
[3] Kim J J,Baik J J.Effects of inflow turbulence intensity on flow and pollutant dispersion in an urban street canyon[J].Journal of Wind Engineering and Industrial Aerodynamics,2003,91(3):309-329.
[4] Cheng W C,Liu C H.Large-eddy simulation of flow and pollutant transports in and above two-dimensional idealized street canyons[J].Boundary-Layer Meteorology,2011,139(3):411-437.
[5] Li X X,Liu C H,Leung D Y C.Large-eddy simulation of flow and pollutant dispersion in high-aspect-ratio urban street canyons with wall model[J].Boundary-Layer Meteorology,2008,129(2):249-268.
[6] Cai X M.Effects of differential wall heating in street canyons on dispersion and ventilation characteristics of a passive scalar[J].Atmospheric Environment,2012,51:268-277.
[7] Li X X,Liu C H,Leung D Y C,et al.Recent progress in CFD modelling of wind field and pollutant transport in street canyons[J].Atmospheric Environment,2006,40(29):5640-5658.
[8] Ng E,Yuan C,Chen L,et al.Improving the wind environment in high-density cities by understanding urban morphology and surface roughness:A study in Hong Kong[J].Landscape and Urban Planning,2011,101(1):59-74.
[9] 何泽能,高阳华,李永华,等.城市街道峡谷对称性对内部气流场的影响研究[J].气象与环境学报,2008,24(2):62-67.
[10] 谢静芳,李磊,郭文利,等.民居CO中毒事件气象条件分析及数值模拟[J].气象与环境学报,2010,26(1):63-68.
[11] 李磊,胡非,刘京.CFD技术在我国城市气候环境微尺度问题中的应用[J].气象科技进展,2015,5(6):23-30.
[12] Chang C H,Meroney R N.Numerical and physical modeling of bluff body flow and dispersion in urban street canyons[J].Journal of Wind Engineering and Industrial Aerodynamics,2001,89(14/15):1325-1334.
[13] Chan A T,Au W T W,So E S P.Strategic guidelines for street canyon geometry to achieve sustainable street air quality-part Ⅱ:Multiple canopies and canyons[J].Atmospheric Environment,2003,37(20):2761-2772.
[14] 何雨峰.二维街谷风场和污染物扩散的数值模拟研究[D].上海:华东师范大学,2013.
[15] Leitl B S M.Cedval at Hamburg University[EB/OL].http://www.mi.uni-hamburg.de/cedval.
[16] Miao Y C,Liu S H,Chen B C,et al.Simulating urban flow and dispersion in Beijing by coupling a CFD model with the WRF model[J].Advances in Atmospheric Sciences,2013,30(6):1663-1678.
[17] 游立军,张秀芝,张晓东,等.CFD在建筑物对气象台站测风影响分析中的应用[J].气象与环境学报,2014,30(3):100-105.
[18] Habilomatis G,Chaloulakou A.A CFD modeling study in an urban street canyon for ultrafine particles and population exposure:The intake fraction approach[J].Science of the Total Environment,2015,530-531:227-232.
[19] Wang Y,Zhong K,Zhang N B,et al.Numerical analysis of solar radiation effects on flow patterns in street canyons[J].Engineering Applications of Computational Fluid Mechanics,2014,8(2):252-262.
[20] 朱强,亢燕铭,杨方,等.上游建筑对街道峡谷内流场和污染物分布特征的影响[J].中国环境科学,2015,35(1):45-54.
[21] 谢晓敏,黄震,王嘉松.日光照射地面对街道峡谷内流场的影响研究[J].水动力学研究与进展:A辑,2004,19(S1):865-870.
[22] Sini J F,Anquetin S,Mestayer P G.Pollutant dispersion and thermal effects in urban street canyons[J].Atmospheric Environment,1996,30(15):2659-2677.
[23] 李磊,胡非,程雪玲,等.Fluent在城市街区大气环境中的一个应用[J].中国科学院研究生院学报,2004,21(4):476-480.
[24] 王炫.基于CFD模型的内陆核电厂厂区流场模拟[J].气象与环境学报,2012,28(3):54-60.
[25] 桑建国,刘辉志,王保民,等.街谷环流和热力结构的数值模拟[J].应用气象学报,2002,13(S1):69-81.
[26] Park S K,Kim S D,Lee H.Dispersion characteristics of vehicle emission in an urban street canyon[J].Science of the Total Environment,2004,323(1/3):263-271.
[27] Miao Y C,Liu S H,Zheng Y J,et al.Numerical study of traffic pollutant dispersion within different street canyon configurations[J].Advances in Meteorology,2014,2014:458671.

Distribution characteristics of wind and pollutant concentration fields in a parallel urban block

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 8

Metrics

Comments

Recommended 0

[1]	XU Hui, ZHANG Liang. Application of field observation combined with CFD simulation method in evaluation of building wind energy [J]. Journal of Meteorology and Environment, 2016, 32(6): 166-173.
[2]	CHEN Gang, LI Ke-fei, YANG Hong-bin, ZOU Xu-dong, TIAN Guang-yuan, ZHAI Qing-fei, HU Wei. Progress of application of CFD simulation for wind energy resource [J]. Journal of Meteorology and Environment, 2016, 32(5): 160-164.
[3]	YAN Xiao-yu,GOU Xiao-hui,LIU Yu-lan,DU Juan-juan. Characteristics of concentration of air pollutant and its relationship with meteorological conditions in Yinchuan [J]. Journal of Meteorology and Environment, 2015, 31(2): 21-30.
[4]	ZHANG Meng ; LIN Lin;ZHANG Zi-yi. Characteristics of air quality pollution and its countermeasure in Changchun, China [J]. Journal of Meteorology and Environment, 2009, 25(3): 57-61.
[5]	HE Ze-neng GAO Yang-hua LI Yong-hua LI Zhen-shan . Effects of symmetry of urban street canyons on their inner airflow fields [J]. Journal of Meteorology and Environment, 2008, 24(2): 62-67.
[6]	CHEN Yi-sheng PANG Yun-ji YAN Yong-wang . Numerical simulation of the effects of building symmetry on the airflow field and pollutant distribution [J]. Journal of Meteorology and Environment, 2008, 24(2): 58-61.
[7]	SUN MeilingHAN SuqinYAO QingBIAN Hai. Analysis of calm wind and its relationship with pollutant concentration in Tianjin [J]. Journal of Meteorology and Environment, 2007, 23(2): 21-24.
[8]	HU Cheng PAN Meixia. Evaluating urban non-point source pollution load [J]. Journal of Meteorology and Environment, 2006, 22(5): 14-18.