This work analyses the aerodynamic effects of avenue-like tree planting on the flow field and dispersion of pollutants in urban street canyons by means of large eddy simulations (LES) coupled with the Dynamics Smagorinsky-Lilly Subgrid scale model and the advection-diffusion module for concentration prediction using the commercial CFD software FLUENT. Flow and concentration levels are compared between an empty (i.e. tree-free) street canyon and one containing avenue-like tree planting with two porosities of λ = 80 m-1 and λ = 200 m-1. In the presence of trees, considerably larger pollutant concentrations near the leeward wall and slightly lower concentrations near the windward wall are observed in comparison to the tree-free case. The difference in porosities did not play a significant role. Simulation results obtained by LES are agreeable to wind tunnel (WT) measurements due to the resolution of the internally induced fluctuations.

Large Eddy Simulation of the aerodynamic role of trees on airflow and pollutant dispersion in urban street canyons

BUCCOLIERI, RICCARDO
Secondo
;
2012-01-01

Abstract

This work analyses the aerodynamic effects of avenue-like tree planting on the flow field and dispersion of pollutants in urban street canyons by means of large eddy simulations (LES) coupled with the Dynamics Smagorinsky-Lilly Subgrid scale model and the advection-diffusion module for concentration prediction using the commercial CFD software FLUENT. Flow and concentration levels are compared between an empty (i.e. tree-free) street canyon and one containing avenue-like tree planting with two porosities of λ = 80 m-1 and λ = 200 m-1. In the presence of trees, considerably larger pollutant concentrations near the leeward wall and slightly lower concentrations near the windward wall are observed in comparison to the tree-free case. The difference in porosities did not play a significant role. Simulation results obtained by LES are agreeable to wind tunnel (WT) measurements due to the resolution of the internally induced fluctuations.
2012
978-1-907396-80-9
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11587/411793
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