Analysis of Pollutant Dispersion in a Realistic Urban Street Canyon Using Coupled CFD and Chemical Reaction Modeling
Studies in actual urban settings that integrate chemical reaction modeling, radiation, and particular emissions are mandatory to evaluate the effects of traffic-related air pollution on street canyons. In this paper, airflow patterns and reactive pollutant behavior for over 24 h, in a realistic urba...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-08-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/10/9/479 |
| _version_ | 1811214726244335616 |
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| author | Franchesca G. Gonzalez Olivardia Qi Zhang Tomohito Matsuo Hikari Shimadera Akira Kondo |
| author_facet | Franchesca G. Gonzalez Olivardia Qi Zhang Tomohito Matsuo Hikari Shimadera Akira Kondo |
| author_sort | Franchesca G. Gonzalez Olivardia |
| collection | DOAJ |
| description | Studies in actual urban settings that integrate chemical reaction modeling, radiation, and particular emissions are mandatory to evaluate the effects of traffic-related air pollution on street canyons. In this paper, airflow patterns and reactive pollutant behavior for over 24 h, in a realistic urban canyon in Osaka City, Japan, was conducted using a computational fluid dynamics (CFD) model coupled with a chemical reaction model (CBM-IV). The boundary conditions for the CFD model were obtained from mesoscale meteorological and air quality models. Inherent street canyon processes, such as ground and wall radiation, were evaluated using a surface energy budget model of the ground and a building envelope model, respectively. The CFD-coupled chemical reaction model surpassed the mesoscale models in describing the NO, NO<sub>2</sub>, and O<sub>3</sub> transport process, representing pollutants concentrations more accurately within the street canyon since the latter cannot capture the local phenomena because of coarse grid resolution. This work showed that the concentration of pollutants in the urban canyon is heavily reliant on roadside emissions and airflow patterns, which, in turn, is strongly affected by the heterogeneity of the urban layout. The CFD-coupled chemical reaction model characterized better the complex three-dimensional site and hour-dependent dispersion of contaminants within an urban canyon. |
| first_indexed | 2024-04-12T06:09:29Z |
| format | Article |
| id | doaj.art-77e24875621a45d298816ce1bb759d42 |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-04-12T06:09:29Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-77e24875621a45d298816ce1bb759d422022-12-22T03:44:45ZengMDPI AGAtmosphere2073-44332019-08-0110947910.3390/atmos10090479atmos10090479Analysis of Pollutant Dispersion in a Realistic Urban Street Canyon Using Coupled CFD and Chemical Reaction ModelingFranchesca G. Gonzalez Olivardia0Qi Zhang1Tomohito Matsuo2Hikari Shimadera3Akira Kondo4Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, JapanGraduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, JapanGraduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, JapanGraduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, JapanGraduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, JapanStudies in actual urban settings that integrate chemical reaction modeling, radiation, and particular emissions are mandatory to evaluate the effects of traffic-related air pollution on street canyons. In this paper, airflow patterns and reactive pollutant behavior for over 24 h, in a realistic urban canyon in Osaka City, Japan, was conducted using a computational fluid dynamics (CFD) model coupled with a chemical reaction model (CBM-IV). The boundary conditions for the CFD model were obtained from mesoscale meteorological and air quality models. Inherent street canyon processes, such as ground and wall radiation, were evaluated using a surface energy budget model of the ground and a building envelope model, respectively. The CFD-coupled chemical reaction model surpassed the mesoscale models in describing the NO, NO<sub>2</sub>, and O<sub>3</sub> transport process, representing pollutants concentrations more accurately within the street canyon since the latter cannot capture the local phenomena because of coarse grid resolution. This work showed that the concentration of pollutants in the urban canyon is heavily reliant on roadside emissions and airflow patterns, which, in turn, is strongly affected by the heterogeneity of the urban layout. The CFD-coupled chemical reaction model characterized better the complex three-dimensional site and hour-dependent dispersion of contaminants within an urban canyon.https://www.mdpi.com/2073-4433/10/9/479CFDchemical reaction modelurban canyonradiationmesoscale modelsreactive pollutants |
| spellingShingle | Franchesca G. Gonzalez Olivardia Qi Zhang Tomohito Matsuo Hikari Shimadera Akira Kondo Analysis of Pollutant Dispersion in a Realistic Urban Street Canyon Using Coupled CFD and Chemical Reaction Modeling Atmosphere CFD chemical reaction model urban canyon radiation mesoscale models reactive pollutants |
| title | Analysis of Pollutant Dispersion in a Realistic Urban Street Canyon Using Coupled CFD and Chemical Reaction Modeling |
| title_full | Analysis of Pollutant Dispersion in a Realistic Urban Street Canyon Using Coupled CFD and Chemical Reaction Modeling |
| title_fullStr | Analysis of Pollutant Dispersion in a Realistic Urban Street Canyon Using Coupled CFD and Chemical Reaction Modeling |
| title_full_unstemmed | Analysis of Pollutant Dispersion in a Realistic Urban Street Canyon Using Coupled CFD and Chemical Reaction Modeling |
| title_short | Analysis of Pollutant Dispersion in a Realistic Urban Street Canyon Using Coupled CFD and Chemical Reaction Modeling |
| title_sort | analysis of pollutant dispersion in a realistic urban street canyon using coupled cfd and chemical reaction modeling |
| topic | CFD chemical reaction model urban canyon radiation mesoscale models reactive pollutants |
| url | https://www.mdpi.com/2073-4433/10/9/479 |
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