Abstract
Large eddy simulations with meshes fine enough to resolve the roads have been performed to investigate the characteristics of convective boundary layer over Otemachi and the Imperial Palace as an example of urban area. Nondimensional profiles of mean temperature and turbulent intensities agree well with experimental data, and it is shown that the vertical convection and the entrainment are more effective when the ground surface is heated uniformly. It is also shown that many thermals grow up from the asphalt roads while the down stream region are generated around the Imperial Palace.
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