Study on wind aerodynamic and flow characteristics of triangular-shaped tall buildings and CFD simulation in order to assess drag coefficient

Tall modern buildings are extremely sensitive to the wind. Thus, assessment of wind loads to design these buildings is essential. The purpose of this study is first to introduce a theoretical framework and simultaneously express basic aerodynamic studies. Furthermore, assessments are made to reduce drag coefficient performance of aerodynamic modification approaches including chamfered, rounded, and recessed corners as well as the performance of aerodynamic formations namely, set-back, taper, and 45-deg helical in a tall triangular building of about 120 m (40 stories). CFD simulation of this study is done by Autodesk Flow Design 2014. Building scales are presumed to be B = 1/6H. The results show that aerodynamic modification of rounded-corners, tapered are capable to cause a reduction in the drag coefficient of the building by 66% and 24%, respectively. Moreover, the technique of aerodynamic modification is approximately 74% more efficient to meet wind effect than aerodynamic form techniques. (C) 2019 The Authors. Published by Elsevier B.V.