Numerical model to characterize the thermal comfort in new ecodistricts: methodology and validation through the canyon street case

In built-up areas, the urban structures affect the radiative and thermal environment. The numerical simulation models provide informations about urban thermal performance for many ranges of urban configurations. This paper presents a validation of a numerical approach based on the coupling of a CFD model (Code_Saturne software developed by E.D.F) and thermo-radiative model (SOLENE software developed by CERMA laboratory). The results of the coupled simulations are compared with in situ data obtained during EM2PAU campaign. The experimental configuration was formed of two lines of steel containers buildings composing one street canyon. Thermocouples are fixed on the container surface temperature of the two canyon walls, roofs and ground. Shortwave radiation and net all-wave radiation are measured by three radiometers. Measurements of air temperature inside the containers, wind speed and direction are carried out and then used as boundary conditions in the coupling simulations. The simulated wind velocity and surface temperature are compared with the measurements for one day with clear sky conditions. The numerical coupling model developed will be later use for other studies aiming to characterize the comfort parameters for more realistic geometry of eco-districts.