Wind and Structures

Techno-Press (테크노프레스)
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The effects of grooves on wind characteristics of tall cylinder buildings

  • Yuan, Wei-bin (College of Architecture and Civil Engineering, Zhejiang University of Technology) ;
  • Yu, Nan-ting (School of Engineering, University of Plymouth) ;
  • Wang, Zhao (College of Architecture and Civil Engineering, Zhejiang University of Technology)
  • Received : 2017.10.10
  • Accepted : 2018.01.23
  • Published : 2018.02.25
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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 $2{\times}10^7$, 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 ($6.6{\times}10^4{\leq}Re{\leq}3.3{\times}10^5$ and $9.9{\times}10^6{\leq}Re{\leq}7.2{\times}10^7$), 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.

Keywords

Acknowledgement

Supported by : Plymouth University

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