Numerical modeling of contaminants transport in community points with chemical reactions
DOI:
https://doi.org/10.26577/JMMCS.2021.v109.i1.06Keywords:
urban street canyon, turbulent model, Navier-Stokes equations, LES model, chemical reaction, air pollution, concentration, polluting emission, ozone×Abstract
In this work, we used numerical modeling of the spread of pollutants due to the occurrence of an exothermic chemical reaction near the roadway inside a street canyon. In the course of the study, the dispersion properties of gas when colliding with idealized buildings were studied, an assessment was made that characterizes the spread of the pollutant concentration, and the process of the appearance of zones with increased turbulence, in which vortices are formed, which impede the ventilation properties of the horizontal flow, was analyzed. The reactive gases in question are NO and NO2 emitted into the canyon area as a result of ozone traffic. The results obtained can be used in the future for use by transport designers and road engineers, whose goal is to reduce the concentration of nitrogen oxides near the pedestrian zone of the city.
References
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[2] Kumar P., Ketzel M., Vardoulakis S., Pirjola L., Britter R., Dynamics and dispersion modelling of nanoparticles from road traffic in the urban atmospheric-A review// Journal of Aerosol Science, 2011, pp.580–603.
[3] Oke T.R. Street design and urban canopy layer climate // Energy and Buildings, 1988, pp.103-113.
[4] Tominaga Y., Stathopoulos T., Ten questions concerning modeling of near-field pollutant dispersion in the built environment // Building and Environment, 105, 2016, pp.390–402.
[5] Tominaga Y, Stathopoulos T, CFD simulations of near-field pollutant dispersion with different plume buoyancies // Building and Environment, 2018, doi: 10.1016.
[6] Baik J.J., Kim J.J., On the escape of pollutants from urban street canyons // Atmospheric Environment, 36, 2002, pp. 527-536.
[7] Bottema M., Urban roughness modelling in relation to pollutant dispersion// Atmospheric Environment, 31, 1997, pp.3059–3075.
[8] Kastner-Klein P., Plate E.J., Wind-tunnel study of concentration fields in street canyons// Atmospheric Environment, 33, 1999, pp.3973–3979.
[9] Pavageau M., Schatzmann M., Wind tunnel measurements of concentration fluctuations in an urban street canyon // Atmospheric Environment, 33, 1999, pp.3961–3971.
[10] Meroney R.M., et al., Study of line source characteristics for 2-D physical modelling of pollutant dispersion in street canyons // Journal of Wind Engineering and Industrial Aerodynamics, 62, 1996, pp.37-56.
[11] Baik J.J., Kim J.J, A numerical study of flow and pollutant dispersion characteristics in urban street canyons // Journal of Applied Meteorology, 38, 1999, pp.1576-1589.
[12] Walton A., Cheng A.Y.S., Large-eddy simulation of pollution dispersion in an urban street canyon – Part II: idealized canyon simulation // Atmospheric Environment, 36, 2002, pp.3615-3627.
[13] Liu C.H., et al., On the prediction of air pollutant exchange rates in street canyons of different aspect ratios using large-eddy simulation // Atmospheric Environment, 39, 2005, pp.1567-1574.
[14] Jeong S.J., Andrews M.J., Application of the k–e turbulence model to the high Reynolds number skimming flow field of an urban street canyon // Atmospheric Environment, 36, 2002, pp.1137–1145.
[15] Carpenter L.J., Clemitshaw K.C., Burgess R.A., Penkett S.A., Capes J.N., McFadyen, Investigation and evaluation of the NOx/O3 photochemical steady state // Atmospheric Environment, 32, 1998, pp.3353–3365.
[16] Baker J., et al, A study of the dispersion and transport of reactive pollutants in and above street canyons e a large eddy simulation // Atmospheric Environment, 38, 2004, pp.6883-6892.
[17] Zhong J., Cai X.M., Bloss W.J., Modelling the dispersion and transport of reactive pollutants in adeep urban street canyon: Using large-eddy simulation // Enviromental Pollution, 200, 2015, pp.42-52.
[18] Kim M.J., et al., Urban air quality modeling with full O3-NOx-VOC chemistry: implications for O3 and PM air quality in a street canyon // Atmospheric Environment, 47, 2011, pp.330-340.
[19]Kwak K.H., Baik J.J., A CFD modeling study of the impacts of NOx and VOC emissions on reactive pollutant dispersion in and above a street canyon //
Atmospheric Environment, 46, 2012.
[20] Denev J.A., Frohlich J., Bockhorn H. , Direct Numerical Simulation of mixing and chemical reactions in a round jet into a crossflow- a benchmark // In Trans. Of the High Perfomance Computing Center Stuttgart (HLRS) 2006. Springer. Editors: W.E.Nagel, W. Jaeger and M. Resch, 2006, pp. 237-251.
[21] ANSYS Fluent theory guide 12.0, Canonsburg, PA: ANSYS Ltd, 2012.
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Published
2021-09-15
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Section
Mathematical modeling
