Document Detail

Numerical modeling on air quality in an urban environment with changes of the aspect ratio and wind direction.
MedLine Citation:
PMID:  23192299     Owner:  NLM     Status:  Publisher    
Due to heavy traffic emissions within an urban environment, air quality during the last decade becomes worse year by year and hazard to public health. In the present work, numerical modeling of flow and dispersion of gaseous emissions from vehicle exhaust in a street canyon were investigated under changes of the aspect ratio and wind direction. The three-dimensional flow and dispersion of gaseous pollutants were modeled using a computational fluid dynamics (CFD) model which was numerically solved using Reynolds-averaged Navier-Stokes (RANS) equations. The diffusion flow field in the atmospheric boundary layer within the street canyon was studied for different aspect ratios (W/H = 1/2, 3/4, and 1) and wind directions (θ = 90°, 112.5°, 135°, and 157.5°). The numerical models were validated against wind tunnel results to optimize the turbulence model. The numerical results agreed well with the wind tunnel results. The simulation demonstrated that the minimum concentration at the human respiration height within the street canyon was on the windward side for aspect ratios W/H = 1/2 and 1 and wind directions θ = 112.5°, 135°, and 157.5°. The pollutant concentration level decreases as the wind direction and aspect ratio increase. The wind velocity and turbulence intensity increase as the aspect ratio and wind direction increase.
Mohamed F Yassin
Related Documents :
15065729 - Real-time control of ultrafast laser micromachining by laser-induced breakdown spectros...
2626059 - Control analysis of time-dependent metabolic systems.
12779619 - Progress toward controlling in vivo fibrillating sheep atria using a nonlinear-dynamics...
18601299 - Experimental determination of flux control distribution in biochemical systems: in vitr...
24517759 - Capacitor blocks for linear transformer driver stages.
14504999 - Stabilizing feedback of a nonlinear process involving uncertain data.
20588489 - Ingaas/gaas saturable absorber for diode-pumped passively q-switched dual-wavelength tm...
18542149 - Electro-optic and nonlinear optical properties of ion implanted waveguides in organic c...
12662819 - Activity in sparsely connected excitatory neural networks: effect of connectivity.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-29
Journal Detail:
Title:  Environmental science and pollution research international     Volume:  -     ISSN:  1614-7499     ISO Abbreviation:  Environ Sci Pollut Res Int     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9441769     Medline TA:  Environ Sci Pollut Res Int     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Environmental Technology and Management, Kuwait University, P.O. Box 5969, Kuwait, Safat, 13060, Kuwait,
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Comparison of disease-specific survival in the United States and Korea after resection for early-sta...
Next Document:  A multibiomarker approach on the Atlantic tomcod (Microgadus tomcod) in the St. Lawrence Estuary.