Numerical simulations and wind tunnel studies of pollutant dispersion in the urban street canyons with different height arrangements
學年 101
學期 2
出版（發表）日期 2013-04-01
作品名稱 Numerical simulations and wind tunnel studies of pollutant dispersion in the urban street canyons with different height arrangements
作品名稱（其他語言）
著者 Chang, Cheng-Hsin; Lin, Jin-Shian; Cheng, Chii-Ming; Hong, Yung-Shan
單位
出版者
著錄名稱、卷期、頁數 Journal of Marine Science and Technology 21 (2), p.119-126
摘要 Air pollution in big city areas resulting from exhaust emissions is a major urban problem. Often traffic pollution excess controls air pollution management decisions. There are a number of elaborate predictive models of pollutant dispersion and diffusion that address the effects of variable shapes of city buildings on pollutant concentrations, but few are fully validated. This study presents ventilation behavior in different street canyon configurations. To evaluate dispersion in a model urban street canyon, a series of tests with various street canyons with different height in upwind and downwind of street canyon are presented. These buildings were arranged in 2-D configurations with different height in upwind and downwind of street canyon. The results showed that a higher concentration of pollutants accumulates under the leeward of the street canyon due to the occurrence of a clockwise vortex inside the street canyon when the street canyon aspect ratio (B/H) is 2. On the contrary, over the windward of the street canyon, a lower concentration of pollutants accumulates due to the occurrence of an anti-clockwise vortex. The flow and dispersion of gases emitted by a line source located between two buildings inside of the urban street canyons were also determined by numerical model. Calculations were compared against CFD prediction in an Environmental Wind Tunnel of Wind Engineering Center at Tamkang University.
關鍵字 wind tunnel experiment;urban street canyon;numerical simulation;dispersion
語言 en
ISSN 1023-2796
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 JPN
公開徵稿
出版型式 ,電子版,紙本
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