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Wind and Structures
  Volume 25, Number 5, November 2017 , pages 475-492

Aerodynamic coefficients of inclined and yawed circular cylinders with different surface configurations
Siyuan Lin, Mingshui Li and Haili Liao

    nclined and yawed circular cylinder is an essential element in the widespread range of structures. As one of the applications, cables on bridges were reported to have the possibility of suffering a kind of large amplitude vibration called dry galloping. In order to have a detailed understanding of the aerodynamics related to dry galloping, this study carried out a set of wind tunnel tests for the inclined and yawed circular cylinders. The aerodynamic coefficients of circular cylinders with three surface configurations, including smooth, dimpled pattern and helical fillet are tested using the force balance under a wide range of inclination and yaw angles in the wind tunnel. The Reynolds number ranges from 2 X105 to 7X105 during the test. The influence of turbulence intensity on the drag and lift coefficients is corrected. The effects of inclination angle yaw angle and surface configurations on the aerodynamic coefficients are discussed. Adopting the existed the quasi-steady model, the nondimensional aerodynamic damping parameters for the cylinders with three kinds of surface configurations are evaluated. It is found that surface with helical fillet or dimpled pattern have the potential to suppress the dry galloping, while the latter one is more effective.
Key Words
    inclined and yawed circular cylinder; surface configuration; Reynolds number; drag coefficient; lift coefficient; nondimensional aerodynamic damping parameter
Siyuan Lin, Mingshui Li and Haili Liao: Research Centre for Wind Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;
Key Laboratory for Wind Engineering of Sichuan Province, Chengdu, Sichuan 610031, China

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