CFD Analysis of Perforated Building Geometrical Characteristics Impact on Local Wind Environment
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Date
2022-06
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Addis Ababa University
Abstract
With the need to achieve a net-zero goal in the architectural, construction, and engineering sector, there is a rapid growth in the use of passive building design to reduce buildings' carbon footprint. In this research field, replacing or incorporating ventilation systems with natural means has gained wide popularity across the world. To achieve natural cross ventilation in buildings, building perforation presented as a means of wind infiltration. The design of perforated building façades influenced by different architectural insights including cultural and economic motivations. This led to the introduction of unique geometrical features in urban areas. The literature on potential impact of these geometrical features on the local wind environment is still lacking. Hence, the presented study investigates the effect of geometrical features of building perforation on pedestrian level wind condition under different wind conditions. To achieve that, perforation design from existing building was. A lattice Boltzmann method with a detached eddy version of the K-omega-SST turbulence was model was used to conduct a transient CFD simulation for sensitivity study. The result indicates that different geometrical designs of the perforation can result in different near-faced wind conditions and pressure distribution on the faces despite having the same perforation ratio. The designs also exhibit wind amplification and deceleration effect depending on inflow wind conditions including its speed and direction. Different perforation design parameters have also an impact on the air flow pattern and speed inside the building. Therefore, the result indicates a need to characterize indoor activities for inclusion in comfort criteria and comfort analysis for open space cross-ventilated buildings.
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Keywords
Natural ventilation, cross-ventilation, detached-eddy simulation, perforated building, wind comfort, wind speed