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Environ Pollut. 2015 Sep;204:280-8. doi: 10.1016/j.envpol.2015.05.004. Epub 2015 May 16.

Characteristics of air pollutant dispersion around a high-rise building.

Author information

1
Institute for Infrastructure Engineering, University of Western Sydney, Australia; Medical Center, Tsinghua University, China. Electronic address: lixuethermal@163.com.
2
Institute for Infrastructure Engineering, University of Western Sydney, Australia. Electronic address: K.Kwok@uws.edu.au.
3
School of Civil Engineering, Hefei University of Technology, China.
4
Department of Building Services Engineering, Hong Kong Polytechnic University, Hong Kong, China.

Abstract

A numerical wind tunnel model was proposed. The computed results of the pollutant diffusion around a typical Hong Kong high-rise building model (at a linear scale of 1:30), were found to show a similar trend to the outcomes of self-conducted experimental measurements that the pathways of pollutant migration for windward and leeward pollutant emission are different. For the case with windward pollutant emission at the 3rd floor within a re-entry, the pollutant migrated downwards due to the downwash created by the wind. In contrast, for the case with leeward pollution emission, dispersion is dominated by intense turbulent mixing in the near wake and characterized by the upward migration of the pollutant in the leeward re-entry. The simulated results of haze-fog (HF) studies confirm that the pathway of pollutant migration is dominated by wind-structure interaction and buoyancy effect only plays a minor role in the dispersion process.

KEYWORDS:

Air pollutant; CFD; High-rise building; Leeward emission; Windward emission

PMID:
25989454
DOI:
10.1016/j.envpol.2015.05.004
[Indexed for MEDLINE]

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