Field synergy analysis of pollutant dispersion in street canyons and its optimization by adding wind catchers
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Field synergy analysis of pollutant dispersion in street canyons and its optimization by adding wind catchers
1. School of Civil Engineering and Architecture, Wuhan University of Technology, No.122 Luoshi Road, Hongshan District, Wuhan 430070, China 2. School of Architectural Engineering , Huanggang Normal University, No. 146 Xingang Second Road, Huanggang 438000, China 3. School of design and environment, National University of Singapore, 4 Architecture Drive, 117566, Singapore 4. Tour-Solaire.Fr, 8 Impasse des Papillons, F34090 Montpellier, France 5. School of Engineering & Applied Science, Aston University, Birmingham B4 7ET, UK
Abstract
Keywords
The microenvironment, which involves pollutant dispersion of the urban street canyon, is critical
street canyon,
to the health of pedestrians and residents. The objectives of this work are twofold: (i) to effectively
field synergy theory,
assess the pollutant dispersion process based on a theory and (ii) to adopt an appropriate stratigy,
CFD simulation,
i.e., wind catcher, to alleviate the pollution in the street canyons. Pollutant dispersion in street
pollutant dispersion,
canyons is essentially a convective mass transfer process. Because the convective heat transfer process and the mass transfer process are physically similar and the applicability of field synergy theory to turbulence has been verified in the literature, we apply the field synergy theory to the study of pollutant dispersion in street canyons. In this paper, a computational fluid dynamics (CFD) simulation is conducted to investigate the effects of wind catcher, wind speed and the geometry
Research Article
Tingzhen Ming1,2,3, Huina Han1, Zhen Zhao1, Renaud de Richter4, Yongjia Wu1 (), Wei Li5, Nyuk Hien Wong3
wind catcher
Article History Received: 21 December 2019 Revised: 14 August 2020 Accepted: 31 August 2020
of the street canyons on pollutant dispersion. According to the field synergy theory, Sherwood number and field synergy number are used to quantitatively evaluate the wind catcher and wind
© Tsinghua University Press and
speed on the diffusion of pollutants in asymmetric street canyons. The results show that adding
Springer-Verlag GmbH Germany,
wind catchers can significantly improve the air quality of the step-down street canyon and reduce
part of Springer Nature 2020
the average pollutant concentrations in the street canyon by 75%. Higher wind speed enhances diffusion of pollutants differently in different geometric street canyons.
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Introduction
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Indoor/Outdoor Airflow and Air Quality
As a result of rapid urbanization, the demand for transportation is increasing, resulting in increases in the emissions of motor vehicle pollutants and environmental pollution of urban street canyons. For an investigation of the dispersion characteristics of pollutants in street canyons, it is important to predict and evaluate air quality accurately based on urban morphology and meteorological conditions. Numerous computational fluid dynamics (CFD) simulat
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