Investigation of inner and outer flow field characteristics of pyramidal roof rectangular base building due to synopsis wind flow through it by changing the vertical location of the asymmetric opening.

Abstract

Understanding the flow field developed in the proximity of a building due to the synoptic wind flow over it is an essential step in building design. The wind environment around buildings plays a pivotal role not only from the point of view of structural integrity but also impacts the ventilation performance, pedestrian comfort, and dispersion of pollutants. With the rise of the green building idea in response to sustainable living, modern buildings now have a variety of apertures, including windows, doors, and ventilators. These holes affect the flow field by altering the flow characteristics within and outside the structure. The current study aims to enhance knowledge of the flow fields around the structures with openings, both inside and externally. This study aims to examine the wind flow over structures with Pyramidal roofs rectangular base building that have openings exposed to synoptic wind. Using the Computational Fluid Dynamics (CFD) approach, internal flow within the buildings is also examined for optimal ventilation. Numerical simulations are conducted using ANSYS-FLUENT, a commercially available CFD program. The stable Reynolds Averaged Navier Stokes (RANS) equations are solved by numerical simulations. The impact of relative vertical locations of the openings on the flow field is investigated in our case. Relative vertical locations of apertures on building facades have a great impact on the flow field inside and outside the building. When the leeward opening is near the ground surface of the building façade and the windward opening is above the mid-height, the airflow rate increases noticeably. The study offers information on the flow environment inside and outside of Pyramidal roof rectangular base building with openings, which aids in estimating the wind load for the building's structural design and for creating an efficient method of natural ventilation.