Modeling and analysis of the effects of barrier height on automobiles emission dispersion

Abstract In this paper, a mathematical model has been developed that describes the characteristics of fluid flow and dispersion of pollutants in a certain quarter of Almaty city, Kazakhstan. The influence of traffic tidal flow was investigated based on the results of passing vehicles measurements as a source of pollution by the CFD method and on the spatial distribution of pollutants for different types of pollution. To validate the numerical algorithm and mathematical model, a test problem was performed. The RNG k-e turbulence model was used as a turbulent model. The obtained data were compared with the measured and calculated values. After validation of the mathematical model, the main problem was characterized: the pollutant emissions process between houses using different types of pollution sources and the presence of different heights of barriers. The calculated data were compared with the obtained calculated values. In the course of various studies, it has been found that, despite different types of pollutants, the presence of barriers along the road reduces the concentration of harmful substances in the pedestrian zone air. And also the optimal height of this barrier along the road was chosen for maximum protection of the pedestrian part from harmful pollutants. And it was found that when using a barrier with a height of 3 m, the concentration value drops more than two times, as opposed to without a barrier, and a further increase in height is not economically profitable and does not give the desired results.