Development of the simulation method for thermal environment and pollutant diffusion in street canyons with subgrid scale obstacles

This study extends the previous researches of tree canopy models conducted by the present authors to reproduce the effects generated from various small obstacles, including moving objects such as automobiles, in actual urban space. Four test cases of computations were carried out by using the new developed ‘Vehicle Canopy Model’. In the cases without automobiles, k values were largely underpredicted, but the prediction accuracy of k values was greatly improved in the case with moving automobiles.