| DOI: | 10.1016/j.atmosenv.2015.06.022
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| Scopus记录号: | 2-s2.0-84936741954
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| 论文题名: | Flow pattern and pollutant dispersion over three dimensional building arrays |
| 作者: | Shen Z; , Wang B; , Cui G; , Zhang Z
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| 刊名: | Atmospheric Environment
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| ISSN: | 0168-2563
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| EISSN: | 1573-515X
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| 出版年: | 2015
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| 卷: | 116 | | 起始页码: | 202
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| 结束页码: | 215
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| 语种: | 英语
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| 英文关键词: | Flow pattern
; Large-eddy-simulation
; Pollutant dispersion
; Urban canopy
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| Scopus关键词: | Large eddy simulation
; Pollution
; Velocity
; Wakes
; High packing density
; Horseshoe vortices
; Isolated roughness
; Pollutant concentration
; Pollutant dispersions
; Roughness height
; Urban canopies
; Wake interferences
; Flow patterns
; array
; canopy
; concentration (composition)
; flow pattern
; large eddy simulation
; packing
; parameterization
; pollutant transport
; roughness
; simulation
; three-dimensional modeling
; urban area
; vortex
; Article
; building
; canopy
; dispersion
; flow
; pollutant
; priority journal
; simulation
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| Scopus学科分类: | Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
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| 英文摘要: | The flow pattern and pollutant dispersion in urban canopies is investigated by large eddy simulation of flow over an array of cubes. It had been found that the pattern of flow over an isolated cubical obstacle can be characterized by an external wake of horseshoe vortex around the lower part of the windward face and an internal wake of recirculation cavity leeward. The width of the external wake Wex and the size of the internal wake Lin in the isolated roughness flow are used as key parameters to determine the wake effects on the flow and dispersion in the canopy of the same roughness height h in the isolated roughness flow. Flow patterns are categorized into five types based on the packing density as a result. The five types of urban canopy flow are introduced as (1) Isolated roughness flow when the lateral building interval WL is much greater than Wex and the streamwise building interval WS is much greater than Lin; (2) External wake interference flow when WL is less than Wex while WS is greater than Lin; (3) Internal wake interference flow when WS is in the same order of the size of Lin; (4) Skimming flow when WL is less than Wex and WS is less than Lin (5) Street network flow when WL and WS are much less than the Wex and Lin respectively. Results of time-averaging velocity field and pollutant concentration contours are demonstrated for each type of flow patterns. It is concluded that the behavior of flow pattern and pollutant dispersion is governed by the packing density from a very low packing density case, approximated as the flow around an isolated roughness element, to a high packing density case, resembled as the network flow. © 2015 Elsevier Ltd. |
| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/81591
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Department of Mechanical Engineering, Tsinghua University, Beijing, China
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| Recommended Citation: | |
Shen Z,, Wang B,, Cui G,et al. Flow pattern and pollutant dispersion over three dimensional building arrays[J]. Atmospheric Environment,2015-01-01,116
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