Numerical study of thermal influence to pollutant dispersion in the idealized urban street road

Abstract

In this paper, a computational study of air pollution in idealization urban canyons road for various temperature regimes was investigated. To solve this problem, the Reynolds-averaged Navier-Stokes (RANS) equations were used. Moreover, different turbulent models were used to close this system of equations. To test the numerical algorithm and the mathematical model, the test case was performed. The received computational data for different turbulent models were compared with measurement and computational values. After validating the computational and mathematical model, the main problem was characterized: the pollutant emissions process between houses using different grass barrier types (continuous and discontinuous) for different temperature regimes. The computational data were compared with the obtained computational values using various grass barriers types. In the various studies, it was revealed that the presence of barriers along the roads reduces the harmful concentrations in the air. So when using a herbal barrier height of 10 cm, the concentration value drops to a cross-section of x = 5 cm more than 1.5 times compared with no barriers, however, taking into account the temperature effect (TH = 305 K), the concentration value additionally decreases almost 2 times. Increasing the temperature for the roadside with barrier reduces dispersion and deposition of pollutants.