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| Large eddy simulation for effects of square opening at top on wind load of super tall building |
| ZHENG Deqian1, WU Junhao1, MA Wenyong2, MA Zhimin3, PAN Junjun4 |
| 1.College of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China;
2.College of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
3.Guangzhou Fuli Real Estate (Chongqing) Co., Ltd., Chongqing 400030, China;
4.China Construction 8th Engineering Bureau Co., Ltd., Shanghai 200135, China |
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Abstract Top opening is an effective aerodynamic optimization measure for super high-rise buildings, while the influence mechanism of top opening style on the local and overall wind load remains to be investigated. By adopting the spatial-averaged large eddy simulation method, the effects of top opening style on the wind load of three-dimensional square section super high-rise building immersed in turbulence boundary layer, were numerically studied. The inflow wind was consistent with the direction of the opening for all cases, including cylinder model without top opening (i.e., the standard cylinder), the opened and the closed square top opening cylinder models. Firstly, effectiveness of the present numerical simulation method was verified by comparison of the simulated wind pressure coefficients on the closed square top opening model with those of wind tunnel test. Then, distribution characteristics of the mean and fluctuating wind pressure on the building model surface were comparatively analyzed among results of the above cylinder models with & without top opening and the opening style. The influence mechanism of the top opening was discussed from the perspective of the simulated flow field. The results show that the hole at the top affects the position of the flow separation point, the diffusion angle of shear flow and the phenomenon of flow reattachment. The narrow tube effect at the hole makes the wind speed increase sharply, especially the closed hole. The accelerated air flow in the hole disturbs the large-scale vortex, which leads to the more dispersed energy of the vortex, thus weakening the wind pressure on the surface of the structure; At the edge of the top opening, there is a large wind pressure value due to flow separation, and there is an obvious edge effect on the leeward side of the open opening; The effect of closed opening on reducing local wind pressure at the opening is better than that of open opening.
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Received: 04 August 2022
Published: 15 September 2023
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