The work is devoted to approbation of the developed microscale mathematical model of turbulent flow and the transfer of passive gaseous admixture in street canyons and city blocks. Approbation of the constructed numerical method was carried out for the problem of modeling laminar flow in the channel. Verification of the model of turbulent flow and impurity transport was carried out on the problem of flow around a rectangular obstacle and impurity transport in an idealized street canyon.
The results of the numerical prediction of dangerous weather phenomena (strong wind and fog) for the conditions of the city of Tomsk and the Tomsk district are considered. The numerical prediction is carried out with a resolution of 1 km using the WRF and TSUNM3 mesoscale meteorological models. The results of the calculations are compared with the observations obtained for selected dates in 2020 using the meteorological instruments of Research Equipment Sharing Center called “Atmosphere” of the Institute of Atmospheric Optics named after Zuev SB RAS and the airfield service of the Tomsk Airport.
With the developed micro-scale mathematical model for studying turbulent flows and the transfer of passive gaseous impurities in a street canyon, the effect of temperature inhomogeneity on the nature of the spread of harmful emissions in a street canyon when the emission source is located at the leeward side of the canyon, was studied.
The work is devoted to the application of the developed microscale mathematical model for the study of turbulent flows and the transport of passive gaseous impurities in street canyon. Parametric calculations aimed at studying the structure of the flow and the nature of the spread of polluting emissions in a street canyon, depending on the geometric dimensions of the canyon, have been carried out.
The study is focused on developing and testing a 2-D microscale mathematical model and a numerical method for the analysis of turbulent flow and passive gaseous admixture transfer in street canyons. The model was tested by modeling laminar flow in the initial section of a 2-D channel and eddy flow in a channel with sudden expansion. After verification the model was used to study the flow structure in the street canyon depending on the ratio between channel width and building height.
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