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LES analysis on heat environment in densely arrayed tall buildings
-Thermal boundary treatment in actual urban area-

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2520
pages 2439-2448

T. Nozu
Shimizu Corporation, Japan

Toshihiko Tamura
Department of Environmental Science and Technology, Tokyo Institute of Technology, G5-7, 4259 Nagatuda, Midori-ku, Yokohama 226-8502, Japan; and Nippon Kohki Company, Nishigo-mura, Nishishirakawa-gun, Fukushima-Perfecture, 229-8510, Japan

Yasuo Okuda
Building Research Institute, Japan

M. Ohashi
National Institute for Land and Infrastructure Management, Japan

H. Umakawa
Pasco Corporation, Japan

Sinopsis

We have conducted LES (Large Eddy Simulation), focusing on local heat environment in the urban area. For estimating the reference absolute values of wind velocity and temperature of LES, we proposed the computational model for hybrid method of LES and meso-scale meteorological model (MM5). This model was validated by comparing the results of LES with field measurement data. Also, we clarified that the heat convection as a result of mixing is active vertically and the high temperature region is recognized even at a high position in a large cavity formed behind dense tall buildings. Introducing the detailed thermal boundary treatment for temperature in actual urban surface, we examined the physical mechanism of the interaction between the heat transport stemming from the meteorological local circulation and the impact of exhaust heat from urban surfaces.

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