Abstract
The risk of air pollutants like particulate matters on human beings has been widely reported. One main concern is its health impact on people through direct emission or resuspension. In China with the quick growth in private car ownership, the worries about the influence of the moving vehicles on particulate dispersion is growing. In this study, the influence of a moving object on wick formation and particulate dispersion was investigated. An advanced numerical model was developed, in which the unsteady Eulerian RANS model was applied for simulating the airflow, the modified drift-flux model for modelling particulate dispersion, and the dynamic mesh model for mimicking the moving vehicle. The results show that the vehicular movement induces three noticeable vortexes around the moving body, and the faster the running speed, the stronger the secondary airflow generated.
Highlights
The presence of gaseous pollutants and particulate matters (PM) is linked with many health issues such as cardiovascular diseases, asthma, cardiopulmonary death and lung cancer etc., as well as the transmission of infectious diseases [1]
The comparison of velocity contours, flow streamlines, and pollutant concentration contours were first made by observing the steady-state and transientstate solutions, in order to qualitatively capture the general characteristics of the dynamic impact
The results show that the motion induces three noticeable vortexes around the moving vehicle − the faster the travelling speed, the stronger the induced secondary airflow
Summary
The presence of gaseous pollutants and particulate matters (PM) is linked with many health issues such as cardiovascular diseases, asthma, cardiopulmonary death and lung cancer etc., as well as the transmission of infectious diseases [1]. Life expectancy is casually related to community average fine particle pollution concentrations. With the quick growth of the private car ownership, many people in China are worrying about the deleterious impact of CO, NOX and PM2.5 on the pedestrians due to the moving vehicles. The use of advanced CFD techniques to simulate the influence of moving vehicle on such pollutant dispersion was rarely reported. The effects were investigated through both experimental and numerical analyses
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