Numerical simulation of wind flow structures and pollutant dispersion within street canyon under thermally unstable atmospheric conditions

Afiq Witri Muhammad Yazid, Nor Azwadi Che Sidik, Salim Mohamed Salim

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Numerical studies were conducted to envisage the wind flow structures and pollutant dispersion in street canyon for differential heated wall and Froude numbers. Standard k-ε was used as its shows good accuracy compared to Renormalization Group (RNG) k-ε and Realizable k-ε. The obtained results demonstrate that the differentially heated wall/floor gives significant effects on the wind flow field compared with those under isothermal conditions. At high Froude number, there were no discernible effects on the flow structures and pollutant dispersion. At low Froude number however, vortex intensification was observed for the case of ground or leeward heated wall and results in reduced pollutant in street canyon. Meanwhile, for the case of windward heated wall, the ventilation was much reduced and results in higher pollutant in street canyon.

    Original languageEnglish
    Title of host publicationApplied Mechanics and Materials
    PublisherTrans Tech Publications LTD
    Pages655-659
    Number of pages5
    Volume554
    ISBN (Print)9783038351092
    DOIs
    Publication statusPublished - 2014

    Publication series

    NameApplied Mechanics and Materials
    Volume554
    ISSN (Print)16609336
    ISSN (Electronic)16627482

    Keywords

    • Pollutant dispersion
    • Street canyon
    • Thermal flow
    • Turbulence models
    • Wind flow structures

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