| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 100 === In densely-populated areas, where buildings are grouped closely together, wind-driven ventilation is strongly influenced by the surrounding structures. The sheltering effect of the surrounding built-up environment can reduce the wind speed and wind-driven ventilation rate. This study used a three-dimensional Computational Fluid Dynamics (CFD) model to investigate the influences of adjacent building on wind-driven natural ventilation of the downwind building. The influences of building depth, height, width and spacing between the buildings were systemically studied. The simulation results demonstrated that the ventilation rate decreases as the building depth increases, and the influence of building width on the cross ventilation rate of a single building is insignificant. When two identical buildings placed in tandem arrangement, the ventilation rate of downwind building, compared to that of a single building, was notably reduced by 50% when the spacing between two buildings is less than three times of building height. The numerical results also demonstrate that the ventilation rate of downwind building will be significantly reduced when the upwind building width and height was Wu/Wb≧1.5or Hu/Hb≧1.5.
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