Abstract

To have a comprehensive understanding of the complex wind environment at a bridge site in the mountainous area, a numerical simulation study of the wind environment under the mean and the fluctuating wind flow conditions was carried out and the results were compared. First, according to the weighted amplitude wave superposition (WAWS) method, the fluctuating wind speed time history was compiled by UDF. And the wind speed time history was added to the inlet boundary of a numerical empty wind tunnel to verify the feasibility of the simulation method of the fluctuating wind. Then, with a bridge in the mountainous area in Yunnan as the engineering background, a numerical simulation study of the wind environment of the bridge site area under the mean wind flow and the fluctuating wind flow was carried out by using FLUENT. The study indicates that Large Eddy Simulation (LES) method more accurate than Reynold average method with a sufficient number of grids and a short enough time step. The average wind characteristics of the bridge site under the mean wind and the fluctuating wind are not much different. The fluctuating wind characteristics at the bridge site are mainly affected by the terrain and the pulsating component of the wind flow. There are different terrain pulsation effects at the bridge site under different incoming flow directions.

Highlights

  • Due to the complex terrain, the wind characteristics of the mountainous area are different from those of the plain area

  • By taking the mountainous area where the Xiangjiang River Bridge is located as the research object, the bridge site area was scaled to a scale of 1:500 to create a terrain model, and the setting of the transition section in the model was compared to the wind tunnel test of the terrain model (Liu et al 2019)

  • According to the amplitude wave superposition (WAWS) method, the fluctuating wind speed time history was compiled by User-defined Function (UDF), and it was used as the inlet boundary condition of the numerical wind tunnel

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Summary

Introduction

Due to the complex terrain, the wind characteristics of the mountainous area are different from those of the plain area. Wind tunnel tests and numerical simulations are the main methods used to study the wind characteristics in mountain areas. By taking the mountainous area where the Xiangjiang River Bridge is located as the research object, the bridge site area was scaled to a scale of 1:500 to create a terrain model, and the setting of the transition section in the model was compared to the wind tunnel test of the terrain model (Liu et al 2019). In this paper, taking a large-span suspension bridge in Yunnan mountainous area as the research object, and CFD method was used to simulate the wind characteristics of the bridge site.

Large eddy simulation in fluctuating wind environment
Numerical analysis model of bridge site in mountainous area
Result analysis
Turbulence intensity
Conclusion

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