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Volume 55 Issue 4
Jul.  2020
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Article Contents
Journal of Southwest Jiaotong University  > 2020  >  55(4): 780-788.
ZENG Jiadong, LI Mingshui, ZHANG Zhitian, CAO Baozhu. Separation-Reattachment Flows Characteristics of Rectangular High-Rise Buildings with Different Side Ratios[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 780-788. doi: 10.3969/j.issn.0258-2724.20190259
Citation: ZENG Jiadong, LI Mingshui, ZHANG Zhitian, CAO Baozhu. Separation-Reattachment Flows Characteristics of Rectangular High-Rise Buildings with Different Side Ratios[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 780-788. doi: 10.3969/j.issn.0258-2724.20190259
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Separation-Reattachment Flows Characteristics of Rectangular High-Rise Buildings with Different Side Ratios

doi: 10.3969/j.issn.0258-2724.20190259
  • Received Date: 09 Apr 2019
  • Rev Recd Date: 22 Jul 2019
    • Available Online: 15 Jun 2020
  • Publish Date: 01 Aug 2020
    Abstract
  • To study the influents of turbulence characteristics, side ratio, and spatial position on the separation-reattachment flows of rectangular high-rise buildings, Firstly, the measured data of surface pressure under different conditions were obtained by synchronous pressure tests of rectangular building models with different side ratios. Secondly, various factors affecting the evolution of the three-dimensional separation-reattachment flows and the mean separation length of rectangular high-rise buildings were analyzed, the intrinsic correlation between the unsteady aerodynamic forces and the separation-reattachment flows of rectangular buildings under large-scale turbulences was discussed. Finally, the mean separation lengths in the vertical direction were given quantitatively. The results show that the ratio of the turbulence integral scale to the feature size of the building affects the test accuracy of separation-reattachment flows and aerodynamic characteristics, with a maximum deviation of about 24%. The interference of incoming turbulence causes the curvature of the separated shear layers to increase, and enhances the entrainment of the uniform-shear flows in the separation zone, the stable reattachment will occur when the side ratio is 2. The mean separation length of the rectangular high-rise building gradually increases in the vertical direction, correction suggestions for predicting the lateral wind pressure of high-rise buildings are also given based on the test results.

     

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