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THMT-15. Proceedings of the Eighth International Symposium On Turbulence Heat and Mass Transfer
September, 15-18, 2015, Sarajevo, Bosnia and Herzegovina

DOI: 10.1615/ICHMT.2015.THMT-15


ISBN Print: 978-1-56700-427-4

ISBN CD: 978-1-56700-428-8

On modeling and simulations of photochemical smog formation in simplif ed and complex urban areas

pages 683-686
DOI: 10.1615/ICHMT.2015.THMT-15.1510
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SINOPSIS

In the present study we address numerical modeling and simulations of f ow, turbulence and reactive pollutant distributions (smog formation) within and over simplif ed (laboratory scale) and complex (real scale) urban areas. We have extended the recently proposed seamless hybrid T-RANS/VLES approach ([1], [2]) with additional set of the reactive scalars, to represent chemistry of the photochemical smog formation. The smog is generated as a result of a chemical reaction of nitrogen oxides and volatile organic compounds in atmosphere, which is triggered by sunlight. The presence of nitrogen oxides is caused by traff c or industrial emissions. We demonstrate that application of the Generic Reaction Set (GRS) model represents a good compromise between the physical accuracy, numerical eff ciency and robustness in predicting smog formation. The model is validated first by comparisons with experiments for a reactive plume dispersion in decaying turbulence where good results are obtained in predicting radial prof les of NO, NO2 and O3 at different locations behind the point emission source, proving correct modeling of the chemistry. Then, we test combined effects of f ow recirculation and different exposure to the sunlight within a laboratory-scale street canyons. The GRS model predicted local ozone distributions in good agreement with observations. Finally, a real-scale environmental applications (one of neighborhoods in city of Rotterdam, The Netherlands) is presented for typical approaching wind conditions and localized pollution emissions from the main roads.

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