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This work focuses on the evaluation of interference factors and the study of the variation of wind effects on low-rise pitched roof structures with one side kept open to the wind environment under various interference conditions induced by changing the spacing in full blockage configurations. Since no provisions are available in the wind standards for use in designing such structures, the numerical simulations are performed using Ansys CFX fluid flow solver through a standard k − ε turbulence model. Such type of study requires the use of either wind tunnel pressure measurements, or the numerical simulation of the wind environment virtually on a computational fluid dynamics (CFD) domain. In this study, the CFD simulations have been carried out for four different spacing conditions and seven different wind incidence angles varied at the interval of 30° to obtain the wind pressure coefficients (Cp). Using the obtained results, the interference difference (ID) and the interference factor (IF) for each of the considered configurations were determined. The variations of IF along the roof direction were also analyzed. Also, the drag and lift force coefficients were calculated, and their variations were studied. It was found that the increase in spacing and the change in wind incidence angles affected the interference parameters. The wind flow pattern around and inside the structure varied for different wind incidence angles. The formation of eddies at various stagnation regions affected the drag and lift forces acting on the structure.
Journal of The Institution of Engineers (India):Series A – Springer Journals
Published: Dec 1, 2022
Keywords: Pitched roof; Wind interference; Shielding effect; Ansys CFX; Interference factor; Interference difference
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