13.2
Effects of building thermals on turbulent structure in a street canyon
X. M. Cai, Univ. of Birmingham, Birmingham, United Kingdom; and E. Hall, J. A. Salmond, and J. Voogt
This study attempts to shed light on the interaction of the building thermals and turbulence inside an idealised street canyon using large-eddy simulation. A real scale street canyon with a large Reynolds number (~106) and Rayleigh number (~1012) is configured. The street canyon has an aspect ratio of 1 and the building height is 18 m. Wind above the canyon blows at a right angle to the canyon axis. In the control run, there is no temperature difference between air and building/road. The modelled results of wind dynamics produced by LES have been validated by wind tunnel experiments. In other runs, temperatures at the building walls and at the road surface are specified in association with the real data in the BUBBLE project. The results show that the mean wind pattern and turbulence inside the street canyon are altered by the building thermals and momentum flux across the roof-top level is enhanced. .
Session 13, high-resolution (CFD) modeling of flow around buildings and street canyons (parallel with session 12)
Thursday, 26 August 2004, 8:30 AM-12:15 PM
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