Actual Measurement of Exist Building Group's Outdoor Wind Environment And Discrepancy Analysis of Simulation

抄録

The wind environment around buildings is consequently concerned by government agencies, developers, architects, landscape architects, building services engineers and other professionals at different levels. So a great mass of achievements have been gained in the research field of indoor wind environment in architectural physics. However, these achievements cannot serve architects directly in their work of practical design stages. Mostly, simulation softwares of wind environment based on Computational Fluid Dynamics (CFD) are applied to layout of general plans of large scale, which fast simulate conceptual design and provide data for project assessment and optimizing measures. Along with the advancements of computer technologies, CFD may have the potential to be an alternative that is less time-consuming and more cost effective compared with the traditional wind tunnel testing. Scholarly debates over the complexity of outdoor wind environment continue among architectural physicists. This paper focused on actual measurement of outdoor wind environment within 3 high-rise residential communities. The fieldwork in this research wasdivided into two parts: building layout and wind environment. The former part included building height and building interval; and the latter included wind speed and direction inside and outside the communities and satisfaction investigation of wind environment. Therefore, the wind speed ratio was introduced, and the impact on wind environment by building layout could be compared. By comparison between the values of wind speed and direction recorded on different points during the same period, and those simulated in softwares, the complexity of outdoor wind environment was revealed as well as the insufficiency in fast wind environment simulation. The purpose was to give a dlear demonstration to the complex features of outdoor wind environment, at the same time, to find out the deficiency of common wind environment simulation and suggest improvements. After comparison and analysis, outdoor wind speed in residential area was mainly affected by building layout. On the whole, although boundary condition settings in simulation simplify actual condition, the simulation results are still credible. While the applicability of CFD softwares in the stage of general concept, especially in assessment of building layout, was affirmed. In the tide of urbanization in China, a large amount of urban planning and architectural designing projects are underway without guidance by valid environmental evaluation instrument. There is notable difference between temperature distribution in software simulation and that in actual measurement. In actual condition, site temperature is primarily affected by solar radiation and secondly by transpiration. Therefore, some designers and projectors directly take advantage of wind environment simulation softwares in conceptual planning stage, to optimize building layout.