71 巻 (2015) 4 号 p. I_433-I_438
Large Eddy Simulation (LES) with realistic three-dimensional building geometries have been performed for both neutral conditions and unstable thermal conditions. Parallelized Large-Eddy Simulation (PALM) has been implemented for LES modelling. Heterogeneous three-dimensional sensible heat fluxes over impervious urban surfaces at five metres resolution in Shinjuku have been calculated by an urban outdoor-indoor multi-patch energy balance model (3D-City Irradiance). This can calculate sophisticated radiation exchange processes. These values have then been inputted into PALM by the setting of Neumann boundary conditions. The effect of buoyancy from surface heating on turbulent structures within the urban atmospheric boundary layer and the urban canopy layer has generally been investigated. Moreover, special attention has been paid to streaky mechanical and thermal turbulent structures above high-rise buildings, which have been considerably altered.