Field synergy analysis of pollutant dispersion in street canyons and its optimization by adding wind catchers

Tingzhen Ming, Huina Han, Zhen Zhao, Renaud de Richter, Yongjia Wu*, Wei Li, Nyuk Hien Wong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The microenvironment, which involves pollutant dispersion of the urban street canyon, is critical to the health of pedestrians and residents. The objectives of this work are twofold: (i) to effectively assess the pollutant dispersion process based on a theory and (ii) to adopt an appropriate stratigy, i.e., wind catcher, to alleviate the pollution in the street canyons. Pollutant dispersion in street 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 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 speed on the diffusion of pollutants in asymmetric street canyons. The results show that adding wind catchers can significantly improve the air quality of the step-down street canyon and reduce the average pollutant concentrations in the street canyon by 75%. Higher wind speed enhances diffusion of pollutants differently in different geometric street canyons.

Original languageEnglish
JournalBuilding Simulation
Early online date19 Oct 2020
DOIs
Publication statusE-pub ahead of print - 19 Oct 2020

Bibliographical note

© Springer Nature B.V. 2020. The final publication is available at Springer via http://dx.doi.org/10.1007/s12273-020-0720-4

Keywords

  • CFD simulation
  • field synergy theory
  • pollutant dispersion
  • street canyon
  • wind catcher

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