Wind and Structures

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LES study of flow field and aerodynamic forces on a circular cylinder at Re=3900 with focus on grid resolution

  • Hongmiao Jing (State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University) ;
  • Jitao Zhang (School of Civil Engineering, Shijiazhuang Tiedao University) ;
  • Qingkuan Liu (State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University) ;
  • Yangxue Wang (School of Civil Engineering, Shijiazhuang Tiedao University)
  • Received : 2022.12.23
  • Accepted : 2023.03.01
  • Published : 2023.03.25
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Abstract

The large eddy simulation (LES) of the flow around a circular cylinder is not only affected by the sub-grid scale (SGS) model but also by the grid resolution of the computational domain. To study the influence of different grids on the LES results, the LES simulations of the flow around a circular cylinder with different grids at Reynolds number (Re) = 3900 was performed. A circular computational domain with different radial growth rates and circumferential and spanwise grid numbers was adopted for the simulations. Meanwhile, the aerodynamic forces, wind pressure coefficients, mean and instantaneous flow fields, and the effect of grid resolution on them were comprehensively analyzed. The results indicate that the lift coefficient, wind pressure coefficient, and recirculation length are significantly affected by the radial growth rate of the grid and the circumferential grid number. The spanwise grid number has a significant influence on the three-dimensionality of the flow and plays an important role in velocity fluctuations in the wake region. Nevertheless, the aerodynamic coefficients and recirculation length are not sufficiently sensitive to the grid number in the spanwise direction. By comparing the results, it can be concluded that suitable and reliable LES results can be obtained when the radial growth rate is 1.03 or 1.05, the circumferential grid number is 160, 200, or 240, and the spanwise grid number is 64. A radial growth rate 1.05, circumferential grid number 160, and spanwise grid number 64 are recommended to reduce the grid amount and further improve the efficiency.

Keywords

Acknowledgement

The work described in this paper was supported by the Youth Program of National Natural Science Foundation of China (Grant No. 52208494), the Youth Program of Natural Science Foundation of Hebei Province of China (Grant No. E2021210063), the Innovation research group project of National Natural Sciences Foundation of China (Grant No. E2022210078), the Science and Technology Winter Olympics Special Project (Grant No. 21475402D), the High-end Talents Project of Hebei Province of China (Grant No. [2019] 63) and the Graduate Student Innovation Funding Project of Shijiazhuang Tiedao University (YC2023068).

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