CFD characterization of street canyon heating by solar radiation on building walls

摘要: Heat exchange processes between building walls and external air within street canyons is an important topic in quality modelling considering that the thermal fields largely affect local flow dynamics pollutant concentration distribution. Despite abundance of numerical studies, many questions still remain unanswered, ultimately limiting inclusion heat effects mesocale atmospheric models. Of interest this study assessment radiative at terms emissivity (i.e. ratio radiation from a surface to ideal black same temperature), shape factors proportion which leaves strikes toward another building) their relation Richardson number. The approached via computational fluid code OpenFOAM, with large eddy simulations (LES) extension model turbulence canyon Boussinesq approach transfer. Consequences on concentrations are also analysed. A for setting boundary conditions surfaces developed, based database gives correlations flux emitted by surface, under certain weather conditions, as function latitude longitude orientation, time day. As novel result exponential law transfer coefficient Ri (as well emissivity) proposed aspect ratio.