淡江大學機構典藏:Item 987654321/69805
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    題名: Numerical and physical modeling of bluff body flow and dispersion in urban street canyons
    作者: 張正興;Chang, Cheng-hsin;Robert N. Meroney
    貢獻者: 淡江大學土木工程學系
    關鍵詞: Urban street canyon;Dispersion;Bluff body flow;Numerical modeling
    日期: 2001-01-01
    上傳時間: 2011-10-23 20:08:11 (UTC+8)
    摘要: To develop reliable computer models for the bluff body flow and transport of pollutants or chemical and biological (CB) agents in urban environments requires accurate measurements of the basic flow fields for carefully controlled, well-known conditions. Fluid modeling in an industrial wind tunnel provides an opportunity to produce accurate simulations of the bluff body flow and transport of urban pollution or of CB agents associated with urban terrorism incidents. A basic building shape, the Wind Engineering Research Field Laboratory building (WERFL) at Texas Tech University, is used for this study. The urban street canyon was represented by a 1:50 scale WERFL model that was surrounded by models of similar dimensions. These buildings were arranged in various symmetric configurations with different separation distances and different numbers of surrounding building. A series of measurements is made over a generic urban street canyon arrangement using flow visualization, anemometry, pressure transducer and gas chromatography. The experimental data include visualization, velocity and turbulence intensity profiles, surface pressure on the building and dispersion of releasing gas. Results are compared to three-dimensional numerical models of the same configuration using the commercial code, FLUENT 5.3. The effects of grid resolution, boundary conditions, source placement and selection of turbulence model (kappa-epsilon, RNG kappa-epsilon, Reynolds stress, etc.) are examined in a series of sensitivity calculations.
    關聯: Journal of wind engineering and industrial aerodynamics 89(14-15), pp.1325-1334
    DOI: 10.1016/S0167-6105(01)00129-5
    顯示於類別:[土木工程學系暨研究所] 期刊論文

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