摘要

We have conducted LES (Large Eddy Simulation), focusing on local heat environment in the urban area. For estimating the reference absolute values of wind velocity and temperature of LES, we proposed the computational model for hybrid method of LES and meso-scale meteorological model (MM5). This model was validated by comparing the results of LES with field measurement data. Also, we clarified that the heat convection as a result of mixing is active vertically and the high temperature region is recognized even at a high position in a large cavity formed behind dense tall buildings. Introducing the detailed thermal boundary treatment for temperature in actual urban surface, we examined the physical mechanism of the interaction between the heat transport stemming from the meteorological local circulation and the impact of exhaust heat from urban surfaces.