Abstract
Recently vehicle exhaust gas purification systems are going to be developed to prevent air pollution near the roadways. To equip such a device effectively, it is necessary to get a clear picture of diffusion behavior of exhaust gas on the roadways. In this study, the behavior of exhaust gas diffusion from moving vehicles were numerically investigated by Large Eddy Simulation(LES). As the first step of it turbulence intensity, stream line and pressure distribution of mean-flow obtained by LES were compared with existing wind tunnel experiments to evaluate the reliability of air-flow calculation. Fluctuation and distribution of concentration were also investigated.
