Dispersion of pollutants in a street canyon and street intersection under traffic-induced flow and turbulence using a low Re κ-ε model
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.
Keywords: CFD modelling, Eulerian-Lagrangian approach, pollutant dispersion, street canyon, street intersection, traffic-induced flow, turbulence, computational fluid dynamics, air quality, flow rate, traffic pollution, vehicle pollution