• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
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Volume 58 Issue 2
Apr.  2023
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Article Contents
ZHENG Yun, LIU Zhixiang, YU Zhixiang, FU Yanqing. Wind Field Characteristics of Snow-Covered Low-Rise Building Roof Based on PIV Experiments[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 430-437, 461. doi: 10.3969/j.issn.0258-2724.20210262
Citation: ZHENG Yun, LIU Zhixiang, YU Zhixiang, FU Yanqing. Wind Field Characteristics of Snow-Covered Low-Rise Building Roof Based on PIV Experiments[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 430-437, 461. doi: 10.3969/j.issn.0258-2724.20210262

Wind Field Characteristics of Snow-Covered Low-Rise Building Roof Based on PIV Experiments

doi: 10.3969/j.issn.0258-2724.20210262
  • Received Date: 07 Apr 2021
  • Rev Recd Date: 21 Jun 2021
  • Available Online: 09 Nov 2022
  • Publish Date: 06 Jul 2021
  • To investigate the influence of snowdrifts on the flow field above low-rise building roof, the distributions of flow field above six different low-rise building roofs with or without snowdrifts were systematically analyzed through particle image velocimetry (PIV) experiments in wind tunnel combined with large eddy simulation (LES), where the tested models with snowdrifts were obtained by 3D printing based on the results of blowing snow experiments. The results indicate that a typical separation bubble can be formed above the no-snow roof when the approaching flow is separated at the leading edge, in which the obvious inverse flow can be observed. However, when there are snowdrifts on the roof, the backflow near the roof is weakened or even disappeared, which remarkably accelerates the flow velocity near the roof, and the maximum speed increment is about 0.6. Concurrently, the distributions of streamlines for snowdrift cases are closer to the building surface and have a larger velocity gradient, and hence the vorticity is also increased. The further numerical research on the turbulent characteristic above the building roof based on LES indicates that the turbulent kinetic energy and turbulence shear stresses above the snowdrift roof are also significantly smaller than their counterparts above the no-snow roof. However, the snowdrift increases the mean and fluctuating wind pressures in the windward region of the roof, and the reduction ratio is about 15% and 20%, respectively. Through this study, the mechanism of wind and snow load on low-rise buildings can be further analyzed, which can provide a reference for the wind-and-snow resistant design of roof structures.

     

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