Abstract
Temperature distribution around a building standing alone and cyclically standing is calculated with Large-Eddy simulation. The dfference of temperature distribution due to positions of the anthropogenic heat sources is investigated. The intensity of the heat is obtained from GIS data and energy consumption data near Shinjuku, Tokyo. Dependency of the temperature field on the width of the roads is also investigated. When a building stands alone, temperature fields does not so much depend on the positions of the heat sources. However when the buildings form the urban canopy, temperature field depends on the position of heat sources. In case for the heat sources are located at high floors of the building, heat is easily transported above the canopy, and slightly stable layer is generated in the canopy. In case for the heat sources are located low floors, the temperature in whole canopy rises up. When the road width is wider than the width of the buildings, the twin vortices are generated at the rear side of the buildings and air flows in from the side road to the back of the buildings, then go up to above the canopy. As a ersult, heat is easily transported to outside of the canopy. When the road width is narrower than the width of the buildings, the twin vortices are not geneated. The air goes down along the front wall of the buildings and moves to upstream through the side of buildings at upstream side, then goes up again along the side wall of the buildings. The exchange of heat is much reduced.
