| Title |
Effects of Various Conditions for Numerical Analysis on Urban Climate |
| Keywords |
Boundary Condition ; Initial Condition ; Computational Fluid Dynamics |
| Abstract |
Rapid urban development in Tokyo has significantly changed the regional climate and caused various environmental problems, e.g. an increase of O3 concentration, etc. The rise of air temperature in Tokyo during the past one hundred years is much more rapid than that of the global air temperature. Many factors affect the climatic changes in an urban area. The temperature increases due to urbanization are mainly caused by the following: increase of artificial heat releases due to increased energy consumption, increase of the area covered with artificial materials (asphalt, concrete, etc.). Various ideas on urban planning have been proposed in order to minimize the environmental impact, e.g. the replanting of low vegetation areas, the use of water permeable materials, reducing artificial heat release by introducing energy saving measures, etc. Here, the urban climate in the Tokyo area is analyzed with various conditions in order to examine their effects on velocity and temperature fields. Initial temperature profile, seawater temperature, ground heat capacity and artificial heat release were set individually as initial and boundary conditions. The present situation of meteorological phenomena was given by utilizing the numerical data-base for Japan meteorological Agency. The results of CFD analyses of mesoscale climate in the Tokyo area are presented. |