Development of a wind environment database in Tokyo for a comprehensive assessment system for heat island relaxation measures

In Japan, a new assessment system called CASBEE-HI (Comprehensive Assessment System for Building Environmental Efficiency on Heat Island Relaxation) has been developed for evaluation of the effects of various building design-related measures for heat island reduction. To assist the evaluator to examine the wind environment, a wind environment database was developed. In the present paper, a wind environment database for the special 23 wards of Tokyo is described as an example. The present Tokyo database includes results of three-dimensional computational fluid dynamics (CFD) analysis in which all the existing buildings in the special 23 wards of Tokyo are reproduced in three-dimensional geometries in a grid network of approximately 500,000,000 meshes with a spatial resolution of 8 m in the horizontal directions.