Transfer and escape characteristics of outdoor pollutants into an indoor space sheltered by urban-like block arrays using large-eddy simulations

We conducted isothermal large-eddy simulations to generate the velocity and concentration distributions investigate air pollution transport from outside inside of a space surrounded by urban-like block arrays. Contrary previous study, we assumed that in form scalars are generated outdoors not indoors which placed at: 1) middle window, 2) near window wall, 3) street canyon at ground level, 4) level. Results showed regardless scalar source location, accumulated indoor can be explained downdraft effect typically found urban environments. The produced vortices space. For vortex drove indoors. On other hand, outdoor transported located reach where they were eventually also due vortex. average normalized concentrations this study 1.25 – 1.50, 1.00 1.75, 0.25 0.50, 0.0 for C 1 , 2 3 4 respectively. Our suggests natural ventilation studies environments is significant, effects should carefully considered.