Dispersion of pollutants in a street canyon and street intersection under traffic-induced flow and turbulence using a low Re k-εmodel

摘要

A 3-D Eulerian-Lagrangian approach to moving vehicles is presented that takes into account the traffic-induced flow rate and turbulence.The method is applied to pollutant dispersion in an individual street canyon and a system of two street canyons forming a perpendicular intersection.The approach is based on computational fluid dynamics (CFD) calculations using a Eulerian approach for continuous phase and a Lagrangian approach for moving vehicles.The wind speed was assigned values of 4,7 and 12 m/s.One-way and two-way traffic with different traffic rates per lane is considered.In the case of the intersection,a longitudinal wind direction was assumed.Predictions show differences in the pollutant dispersion in the case of one-way and two-way traffic.