Numerical simulation of dispersion in an urban street canyon

Comparison between steady and fluctuating boundary conditions

S. M. Kwa, S. M. Salim

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Over the years, the reliance on CFD to investigate air flow and pollutant dispersion has increased significantly and the majority of these studies have employed Steady Wind Boundary Conditions (SWBC) at the inlet of the computational domain. In reality, wind fluctuates both spatially and temporally and the numerical simulations do not accurately represent field or experimental measurements when the inlet condition is assumed to be constant. Therefore, the aim of the current research is to address the limitations of these existing studies, by developing Fluctuating Wind Boundary Conditions (FWBC). The FWBC are then compared to SWBC in order to determine their suitability in the investigation of air flow and pollutant dispersion in urban street canyons. Three-dimensional (3D) numerical simulations are performed using Large Eddy Simulation (LES). The FWBC produces more realistic results when compared to the frequently employed SWBC.

    Original languageEnglish
    Pages (from-to)55-64
    Number of pages10
    JournalEngineering Letters
    Volume23
    Issue number1
    Publication statusPublished - 2015

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    Boundary conditions
    Computer simulation
    Large eddy simulation
    Air
    Computational fluid dynamics

    Keywords

    • Computational Fluid Dynamics (CFD)
    • Fluctuating Wind Boundary Condition (FWBC)
    • Large Eddy Simulation (LES)
    • Pollutant dispersion
    • Urban street canyon

    Cite this

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    Numerical simulation of dispersion in an urban street canyon : Comparison between steady and fluctuating boundary conditions. / Kwa, S. M.; Salim, S. M.

    In: Engineering Letters, Vol. 23, No. 1, 2015, p. 55-64.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AU - Salim, S. M.

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