Characteristics of Pollutant Dispersion for Movement of a fleet of vehicles Inside a Road Tunnel Using Dynamic Mesh
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Due to the enclosure and low efficiency of ventilation systems inside the tunnels, pollution levels are high, which have become a hot spot research issue recently. The aim of this study is to analyze the characteristics of unsteady particle dispersion when a fleet of vehicles pass through the tunnels under different vehicle speeds (20–60 km/h), combining a realizable k − ε model, Eulerian passive scalar model, and dynamic mesh model. A 450-m three-dimensional road tunnel model containing a fleet of vehicles inside and another 450-m-long outdoor environment model connecting the tunnel exit were both established. CO was selected as a pollutant exhausted from vehicles. The results indicated that pollution levels were severe inside the tunnel, at least 2 times higher than the limitation, and even the traffic wind was significantly high at 60 km/h. An optimal design for ventilation systems should be required to decrease the pollution levels around the tunnel outlet.
KeywordsPollutant dispersion Piston effect Dynamic mesh Road tunnel Numerical simulation
The project is supported by the Natural Science Foundation of China (Number 51808090 and 51808095), China Postdoctoral Science Foundation-funded project (grant number: 2016M601310), LiaoningProvincialNaturalScienceFoundationofChina (grant number: 20180550578), and “the Fundamental Research Funds for the Central Universities” (grant number: DUT18RC(4)015).
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