Evaluation and prediction of the effects of the dispersion of (VOCs) on the population in urban air using ANSYS CFX

A. Ibrir, Y. Kerchich, N. Hadidi, R. Rebhi


Abstract: Indoor-outdoor environments are polluted by volatile organic compounds (VOCs), mainly benzene, toluene, ethylbenzene and the three isomers ortho, meta and para-xylene, commonly known as BTEX. Motor vehicles are the main source of these compounds. In this regard, we propose to study the simulation of the dispersion of benzene, emitted by the exhaust gases of a vehicle in a (3D) medium, in order to predict the concentration of the polluting gas and the different physical dispersion parameters as a function the distance from the emission source of the vehicle to the location of the study and the height of the buildings. In our work, CFD simulations were carried out using the k-ε turbulence model provided by the commercial code ANSYS-CFX. The results showed that whenever the source of pollution approaches the urban environment, pollution remains high in urban areas, which affects the well-being of the population.

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