DOI: 10.1016/j.atmosenv.2015.05.016
Scopus记录号: 2-s2.0-84929325918
论文题名: The influence of an obstacle on flow and pollutant dispersion in neutral and stable boundary layers
作者: Tomas J ; M ; , Pourquie M ; J ; B ; M ; , Jonker H ; J ; J
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 113 起始页码: 236
结束页码: 246
语种: 英语
英文关键词: Boundary layer
; Obstacle
; Pollutant dispersion
; Stratification
; Turbulence
; Wake
Scopus关键词: Atmospheric thermodynamics
; Boundary layer flow
; Boundary layers
; Fences
; Large eddy simulation
; Reynolds number
; Thermal stratification
; Turbulence
; Turbulent flow
; Wakes
; Inflow turbulence
; Obstacle
; Pollutant concentration
; Pollutant dispersions
; Stable boundary layer
; Temperature differences
; Turbulent boundary layers
; Urban environments
; Pollution
; atmospheric plume
; boundary layer
; buoyancy
; concentration (composition)
; flow pattern
; inflow
; large eddy simulation
; Reynolds number
; stratification
; turbulence
; urban atmosphere
; wake
; air quality
; Article
; boundary layer
; dispersion
; flow
; pollutant
; priority journal
; simulation
; temperature
; turbulent flow
; urban area
; velocity
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Predicting pollutant dispersion in urban environments requires accurate treatment of obstacle geometry, inflow turbulence and temperature differences. This paper considers both the influence of thermal stratification and the presence of a single obstacle on pollutant dispersion in turbulent boundary layers (TBLs). Turbulent flow over a fence with line sources of pollutant in its vicinity is simulated by means of Large-Eddy Simulations. Separate 'driver' simulations are done to generate the inflow TBL for several levels of stratification. Using these inflow TBLs the flow development and pollutant dispersion behind the fence, up to 100 fence heights, h, is investigated. It is shown that the decay of velocity and temperature deficit is independent of stability, while the decay of Reynolds stress and concentration excess decreases with increasing stability. For neutral cases the influence of the obstacle is gone after approximately 75. h, while for stable cases near the ground the flow is still accelerated compared to the undisturbed case. The fence does cause a local reduction of stratification and thereby increased pollutant dispersion. However, neglecting the effect of buoyancy results in an underestimation of pollutant concentration by a factor 2.5 at 75. h downstream of the emission source for the most stable case. © 2015 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81713
Appears in Collections: 气候变化事实与影响
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作者单位: Department Process and Energy, Lab. for Aero and Hydrodynamics, Delft University, Leeghwaterstraat 21, CA Delft, Netherlands; Department Geoscience and Remote Sensing, Delft University, PO Box 5048, GA Delft, Netherlands
Recommended Citation:
Tomas J,M,, Pourquie M,et al. The influence of an obstacle on flow and pollutant dispersion in neutral and stable boundary layers[J]. Atmospheric Environment,2015-01-01,113