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LARGE EDDY SIMULATION OF WIND TURBULENCE IN ACTUAL URBAN ENVIRONMENT

Tetsuro Tamura
Department of Environmental Science and Technology, Tokyo Institute of Technology 4259 Nagatsuta, Yokohama 226-8502, Japan

Takeshi Kishida
Wind Engineering Institute 3-29 Kandajinbo-cho, Chiyoda-ku, Tokyo, 101-0051, Japan

Yasuo Okuda
Building Research Institute, Japan

Résumé

In order to establish a sophisticated numerical model for urban atmospheric environment by applying large eddy simulation (LES) technique to wind flows and their turbulence within a city, this study investigates the technological potential and the future trend of LES for employing the computational model which directly represents an actual shape found inside a city, such as buildings, structures, vegetation and various kinds of terrain. A numerical model in an actual urban area has been constructed using GIS (Geophysic Information System) data with high resolution, and the inflow boundary condition has been appropriately given by numerically simulating the turbulence characteristics of natural wind flow.This study has aimed at estimating wind in an actual urban area by combination of LES and MM5 techniques. Also, detailed comparison of LES results with full-scale measurement data has been carried out for the model validation.