The effect of tree planting on traffic pollutant dispersion in an urban street canyon using large eddy simulation with a recycling and rescaling inflow generation method

The influence of various tree planting configurations on tracer gas dispersion in an urban street canyon is studied numerically, using OpenFOAM Large Eddy Simulation (LES). A recycling and rescaling turbulent inflow generation method implemented validated against a canonical backwards-facing step case. simulations are based the CODASC experiments, where was emitted from line sources at level. effect stand density pollutant for first time LES. Performance metric analysis shows that crown porosity, density, concentration field within can be captured by show crowns reduce effectiveness vortex ventilating street, enhance mean pedestrian level leeward wall. novel feature research arises probability functions height canyon. Pedestrians exposed to concentrations almost three times value results have implications greening strategies city streets with heavy traffic.