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Numerical simulation and experimental study of non-stationary downburst outflow based on wall jet model

  • Yongli Zhong (School of Civil Engineering and Architecture, Chongqing University of Science and Technology) ;
  • Yichen Liu (School of Civil Engineering and Architecture, Chongqing University of Science and Technology) ;
  • Hua Zhang (CENTRAL-SOUTH Architectural Design Institute Co., Ltd) ;
  • Zhitao Yan (School of Civil Engineering and Architecture, Chongqing University of Science and Technology) ;
  • Xinpeng Liu (School of Civil Engineering and Architecture, Chongqing University of Science and Technology) ;
  • Jun Luo (School of Civil Engineering and Architecture, Chongqing University of Science and Technology) ;
  • Kaihong Bai (Chongqing Institute of Geology and Mineral Resources) ;
  • Feng Li (Chongqing Urban Investment Infrastructure Construction Co., Ltd)
  • Received : 2023.05.13
  • Accepted : 2024.01.26
  • Published : 2024.02.25
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Abstract

Aiming at the problem of non-stationary wind field simulation of downbursts, a non-stationary down-burst generation system was designed by adding a nozzle and program control valve to the inlet of the original wall jet model. The computational fluid dynamics (CFD) method was used to simulate the downburst. Firstly, the two-dimensional (2D) model was used to study the outflow situation, and the database of working conditions was formed. Then the combined superposition of working conditions was carried out to simulate the full-scale measured downburst. The three-dimensional (3D) large eddy simulation (LES) was used for further verification based on this superposition condition. Finally, the wind tunnel test is used to further verify. The results show that after the valve is opened, the wind ve-locity at low altitude increases rapidly, then stays stable, and the wind velocity at each point fluctuates. The velocity of the 2D model matches the wind velocity trend of the measured downburst well. The 3D model matches the measured downburst flow in terms of wind velocity and pulsation characteris-tics. The time-varying mean wind velocity of the wind tunnel test is in better agreement with the meas-ured time-varying mean wind velocity of the downburst. The power spectrum of fluctuating wind ve-locity at different vertical heights for the test condition also agrees well with the von Karman spectrum, and conforms to the "-5/3" law. The vertical profile of the maximum time-varying average wind veloci-ty obtained from the test shows the basic characteristics of the typical wind profile of the downburst. The effectiveness of the downburst generation system is verified.

Keywords

Acknowledgement

The research described in this paper was financially supported by National Natural Science Foundation of China (Grant No. 52008070, 52178458), the Project funded by the China Postdoctoral Science Foundation (Grant No. 2023M734084), and Chongqing University of Science and Technology Postgraduate Innovation Program (Grant No. YKJCX2220642). Chongqing Natural Science Foundation (CSTB2022NSCQ-MSX0363, CSTB2023NSCQ-LZX0051), and Chongqing Urban Investment Infrastructure Construction Co., Ltd Program (Grant No. CQCT-JS-SC-GC-2022-0079)

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