Numerical investigation on the drag reduction properties of a suction controlled high-rise building |
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| Authors: | Chao-rong Zheng Yao-chun Zhang |
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| Institution: | (1) Department of Mechanical and Industrial Engineering, Concordia University, Montreal, QC, Canada, H3G 1M8;(2) Department of Mechanical and Materials Engineering, The University of Western Ontario, London, ON, Canada, N6A 5B9;(3) Present address: Department of Mechanical Engineering, N.E.D. University of Engineering and Technology, Karachi, Pakistan; |
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| Abstract: | To reduce the wind-induced drag and improve the wind-resistance performance of a high-rise building, steady suction control
is introduced into the building structure. Based on validation of the numerical methods by experiment with suction control
over the flow separation of a 3D backward-facing step, the Reynolds stress equation model is used to investigate the drag
reduction (DR) properties of a high-rise building whose side faces are controlled by all-height suction. Effects of the orifice
geometrical parameters and suction flux parameters on the DR and the separation control are analyzed, and the detailed flow
fields are shown to clarify the mechanism of suction control. The results indicate that suction control is very effective
in reducing the wind loads on the high-rise building model, and only the dimensionless suction flux dominates. Lastly, the
power consumed and the counterforce induced by suction are discussed, the suction models become the “zero-drag” model under
certain suction angles. |
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