Validation of a two-dimensional pollutant dispersion model in an isolated street canyon

Tat Leung Chan, G. Dong, Chun Wah Leung, Chun Shun Cheung, W. T. Hung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

170 Citations (Scopus)

Abstract

A two-dimensional numerical model based on Reynolds-averaged Navier-Stokes equations coupled with a series of standard, Renormalization Group (RNG) and realizable k-ε turbulence models was developed to simulate the fluid-flow development and pollutant dispersion within an isolated street canyon using the FLUENT code. In the present study, the validation of the numerical model was evaluated using an extensive experimental database obtained from the atmospheric boundary layer wind tunnel at the Meteorological Institute of Hamburg University, Germany (J. Wind Eng. Ind. Aerodyn. 62 (1996) 37). Among the studied turbulence models, the RNG k-ε turbulence model was found to be the most optimum turbulence model coupled with the two-dimensional street canyon model developed in the present study. Both the calculated and measured dimensionless pollutant concentrations have been shown to be less dependent on the variation of wind speed and source strength conditions for the studied street canyon aspect ratio of the B/H=1 case. However, the street canyon configuration has significant influence on the pollutant dispersion. The wider street and lower height of the buildings are favorable to pollutant dilution within the street canyon. The fluid-flow development has demonstrated that the rotative vortex or vortices generated within the urban street canyon can transport the pollutants from a line source to the wall surfaces of the buildings.
Original languageEnglish
Pages (from-to)861-872
Number of pages12
JournalAtmospheric Environment
Volume36
Issue number5
DOIs
Publication statusPublished - 24 Jan 2002

Keywords

  • k-ε turbulence models
  • Street canyon
  • Two-dimensional pollutant dispersion model
  • Vehicle emissions
  • Wind tunnel data

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)
  • Pollution

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