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THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer
July, 10-13, 2018, Rio de Janeiro, Brazil

DOI: 10.1615/THMT-18


ISBN Print: 978-1-56700-468-7

ISBN Online: 978-1-56700-467-0

ISSN Print: 2377-2816

Seasonal variations of traffic-induced CO concentration in a city with a large river: A computational study

pages 585-588
DOI: 10.1615/THMT-18.600
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ABSTRAKT

We report on numerical simulation of windless diurnal cycle of pollutant spreading over an urban terrain with a river running through the city, using a RANS algebraic flux model. The case mimics the real environment of Krasnoyarsk region (Russia). Two sets of conditions were considered: "winter" and "summer". In both cases the simulation starts with stable (nocturnal) conditions with penetrative convection gradually developing over the daytime. The main difference between the two cases is in the temperature of the river surface relative to the surroundings. In winter the non-freezing river acts as a source of positive thermal buoyancy, while in summer the cool river at the daytime acts in the opposite way. The overall effect of the river appears significant enough to account for the observed winter accumulation of the pollutant in the city centre.

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