Validation of a two-dimensional pollutant dispersion model in an isolated street canyon

Chan, Tat Leung; Dong, Guohai; Leung, Chun Wah; Cheung, Chun Shun; Hung, W.T.

doi:10.1016/s1352-2310(01)00490-3

Cited by 181 publications

(75 citation statements)

References 16 publications

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“…At all H/W values for a given TI, the magnitude of F a increases as the inflow U increases, Fig 10. This is because the Meroney et al (1996) (Figure adapted from Chan et al, 2002) vortex becomes more pronounced with increasing U.Further, observing Fig. 10, except for H/W = 0.5, the net effect of vertical advection is toward entrainment of UFP into the canyon.…”

Section: Isothermal Cases: Turbulent and Vertical Advective Ufp Fluxmentioning

confidence: 80%

Linking urban aerosol fluxes in street canyons to larger scale emissions

et al. 2010

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Abstract. In this study we investigate ultrafine particle (UFP) fluxes using a first order eddy viscosity turbulence closure Computational Fluid Dynamics (CFD) model and determine the different factors that influence emissions of UFP into the urban boundary layer. Both vertical turbulent fluxes as well as the fluxes due to mean circulatory flow are shown to contribute to the overall ventilation characteristics of street canyons. We then derive a simple parameterised numerical prediction model for canyon top UFP venting which is then compared with tower based micrometeorological flux measurements obtained during the REPARTEE & CityFlux field experiments.

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Section: Isothermal Cases: Turbulent and Vertical Advective Ufp Fluxmentioning

confidence: 80%

Linking urban aerosol fluxes in street canyons to larger scale emissions

et al. 2010

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“…The most important urban air pollutants in terms of emissions and the impact on the environment and human health which could be taken into account are: carbon monoxide (CO), nitrogen oxides (NO and NO 2 ), volatile organic compounds (VOCs), ozone (O3) and aerosol particles with a diameter less than 2.5μm (PM 2,5 ).…”

Section: Urban Air Pollutantsmentioning

confidence: 99%

A Qualitative Study of Air Pollutants from Road Traffic

Raducan¹,

Ștefănescu²

2012

Air Quality - Monitoring and Modeling

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“…These studies often employ simple building confi guration to study how the geometry and different roof shapes can affect airfl ow and pollutant fi elds in a 2D idealized street canyons (Theodoridis & Moussiopoulos,FIGURE 1. Defi nition of the street canyon confi guration cases 2000; Chan, Dong, Leung, Cheung & Hung, 2002;Assimakopoulos, ApSimon & Moussiopoulos, 2003;Xiaomin, Zhen & Jiasong, 2005;Nazridoust & Ahmadi, 2006;Huang, Jin & Sun, 2007;Huang, Hu & Zeng, 2009;Yassin, 2011;Takano & Moonen, 2013). The most commonly RANS turbulent models used in street canyon simulations are the standard k-ε model, renormalization group RNG k-ε model and realizable k-ε model and their performance are tested in some of the studies.…”

Section: Introductionmentioning

confidence: 99%

A numerical analysis of pollutant dispersion in street canyon: influence of the turbulent Schmidt number

Abed

Bouarbi

Bouzit

et al. 2017

Przegląd Naukowy Inżynieria I Kształtowanie Środowiska

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Realizing the growing importance and availability of motor vehicles, we observe that the main source of pollution in the street canyons comes from the dispersion of automobile engine exhaust gas. It represents a substantial effect on the micro-climate conditions in urban areas. Seven idealized-2D building configurations are investigated by numerical simulations. The turbulent Schmidt number is introduced in the pollutant transport equation in order the take into account the proportion between the rate of momentum turbulent transport and the mass turbulent transport by diffusion. In the present paper, we attempt to approach the experimental test results by adjusting the values of turbulent Schmidt number to its corresponding application. It was with interest that we established this link for achieving our objectives, since the numerical results agree well with the experimental ones. The CFD code ANSYS CFX, the k, e and the RNGk-e models of turbulence have been adopted for the resolutions. From the simulation results, the turbulent Schmidt number is a range of 0.1 to 1.3 that has some effect on the prediction of pollutant dispersion in the street canyons. In the case of a flat roof canyon configuration (case: runa000), appropriate turbulent Schmidt number of 0.6 is estimated using the k-epsilon model and of 0.5 using the RNG k-e model.

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Validation of a two-dimensional pollutant dispersion model in an isolated street canyon

Cited by 181 publications

References 16 publications

Linking urban aerosol fluxes in street canyons to larger scale emissions

Linking urban aerosol fluxes in street canyons to larger scale emissions

A Qualitative Study of Air Pollutants from Road Traffic

A numerical analysis of pollutant dispersion in street canyon: influence of the turbulent Schmidt number

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