INFLUENCE OF THERMAL EFFECTS TO POLLUTANT DISPERSION IN IDEALIZED STREET CANYON: NUMERICAL STUDY

In this work, we numerically investigate the process of atmospheric air pollution at various values of the road temperature in idealized urban canyons. To solve this problem, the Reynolds-averaged Navier-Stokes equations (RANS) were used. Closing this system of equations required the use of various turbulent models. The verification of the mathematical model and the numerical algorithm was carried out using a test problem. The results obtained using various turbulent models were compared with experimental data and calculated data of other authors. The main problem considered in this paper is characterized as follows: estimation of emissions of pollutants between buildings using different types of hedge barriers (continuous and intermittent) at different temperatures. The results have shown that the presence of hedge barriers along the roads significantly reduces the concentration of harmful substances in the air. The use of a grass barriers with a total height of 0.1H leads to a decrease in the concentration level to a section X = 0.05H by more than 1.5 times compared with the case of a complete absence of protective barriers. In addition, the temperature conditions (in this case, T-H = 305K) also reduce the concentration value by almost 2 times. Increasing the temperature at the side of the road using the barrier reduces the spread and deposition of pollutants.