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Large-eddy Simulation of Pollutant Dispersion from a Ground-level Area Source Over Urban Street Canyons with Irreversible Chemical Reactions : Volume 11, Issue 1 (23/10/2014)

By Du, T. Z.

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Book Id: WPLBN0003982342
Format Type: PDF Article :
File Size: Pages 3
Reproduction Date: 2015

Title: Large-eddy Simulation of Pollutant Dispersion from a Ground-level Area Source Over Urban Street Canyons with Irreversible Chemical Reactions : Volume 11, Issue 1 (23/10/2014)  
Author: Du, T. Z.
Volume: Vol. 11, Issue 1
Language: English
Subject: Science, Advances, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Liu, C., Zhao, Y. B., & Du, T. Z. (2014). Large-eddy Simulation of Pollutant Dispersion from a Ground-level Area Source Over Urban Street Canyons with Irreversible Chemical Reactions : Volume 11, Issue 1 (23/10/2014). Retrieved from http://worldlibrary.net/


Description
Description: Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China. In this study, the dispersion of chemically reactive pollutants is calculated by large-eddy simulation (LES) in a neutrally stratified urban canopy layer (UCL) over urban areas. As a pilot attempt, idealized street canyons of unity building-height-to-street-width (aspect) ratio are used. Nitric oxide (NO) is emitted from the ground surface of the first street canyon into the domain doped with ozone (O3). In the absence of ultraviolet radiation, this irreversible chemistry produces nitrogen dioxide (NO2), developing a reactive plume over the rough urban surface. A range of timescales of turbulence and chemistry are utilized to examine the mechanism of turbulent mixing and chemical reactions in the UCL. The Damköhler number (Da) and the reaction rate (r) are analyzed along the vertical direction on the plane normal to the prevailing flow at 10 m after the source. The maximum reaction rate peaks at an elevation where Damköhler number Da is equal or close to unity. Hence, comparable timescales of turbulence and reaction could enhance the chemical reactions in the plume.

Summary
Large-eddy simulation of pollutant dispersion from a ground-level area source over urban street canyons with irreversible chemical reactions

Excerpt
Builtjes, P. J. H.: A comparison between chemically reacting plume models and wind tunnel experiments, in: Air Pollution Modeling and its Application II, edited by: Wispelaere, C.,, Plenum Press, New York, 59–83, 1983.; Meeder, J. P. and Nieuwstadt, F. T. M.: Large-eddy simulation of the turbulent dispersion of a reactive plume from a point source into a neutral atmospheric boundary layer, Atmos. Environ., 34, 3563–3573, 2000.; Oke, T. R.: Street design and urban canopy layer climate, Energy Build., 11, 103–113, 1988.; Pope, S. B.: Turbulent Flows, Cambridge University Press, Cambridge, 2000.; Tominaga, Y. and Stathopoulos, T.: CFD modeling of pollution dispersion in a street canyon: Comparison between LES and RANS, J. Wind Eng Ind. Aerodyn., 99, 340–348, 2011.

 

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