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

DOI: 10.1615/THMT-18.600
pages 585-588

Michael Yu. Hrebtov
Institute of Thermophysics of SB RAS,Ac. Lavrentieva ave. 1, Novosibirsk, Russian Federation, 630090; Novosibirsk State University, Pirogova st., 2, Novosibirsk, Russian Federation, 630090

Kemal Hanjalic
Department of Physics, Novosibirsk State University (NSU), 1, Pirogov Str., Novosibirsk, 630090, Russia; Faculty of Applied Sciences, Delft University of Technology (TU Delft), Building 58, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands


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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