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Wind and Structures Volume 26, Number 2, February 2018 , pages 89-98 DOI: https://doi.org/10.12989/was.2018.26.2.089 |
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The effects of grooves on wind characteristics of tall cylinder buildings |
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Wei-bin Yuan, Nan-ting Yu and Zhao Wang
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| Abstract | ||
| For most full-scale tall buildings the Reynolds number of a flow field around a circular cylinder under strong wind is usually greater than 2107, which is difficult to achieve in most wind tunnel tests. To explore the wind characteristics of tall cylindrical buildings with equidirectional grooves from subcritical to transcritical flow (6.6104 Re 3.3105 and 9.9106 Re 7.2107), wind tunnel tests and full-scale large eddy simulations were carried out. The results showed that the rectangular-grooves narrow the wake width due to the downstream movement of the separation point and the deeper grooves cause smaller mean and fluctuating pressure while the peak pressure is little affected. Furthermore, the grooves lead to lower frequency of vortex shedding but the Strouhal number remains at the range from 0.15 to 0.35. The drag coefficient of the cylinders with grooves was found to be 2~3 times as large as that of smooth cylinders. | ||
| Key Words | ||
| tall cylinder buildings; wind characteristics; wind tunnel test; large eddy simulation | ||
| Address | ||
| Wei-bin Yuan: College of Architecture and Civil Engineering, Zhejiang University of Technology, Hangzhou, 310014, PR China; Key Laboratory of Civil Engineering Structures & Disaster Prevention and Mitigation Technology of Zhejiang Province, Hangzhou, 310014, PR China Nan-ting Yu: School of Engineering, University of Plymouth, Plymouth, PL4 8AA, United Kingdom Zhao Wang: College of Architecture and Civil Engineering, Zhejiang University of Technology, Hangzhou, 310014, PR China | ||