Wind and Structures

  • 제18권5호
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  • Pages.511-528
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  • 2014
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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Wake galloping phenomena between two parallel/unparallel cylinders

  • Kim, Sunjoong (Department of Civil and Environmental Engineering, Seoul National University) ;
  • Kim, Ho-Kyung (Department of Civil and Environmental Engineering, Seoul National University)
  • 투고 : 2013.08.23
  • 심사 : 2014.01.18
  • 발행 : 2014.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

The characteristics of wake galloping phenomenon for two parallel/unparallel circular cylinders were investigated via wind tunnel tests. The two cylinders were initially deployed in parallel and wake galloping phenomena were observed by varying the center-to-center distance. The effect of an unparallel arrangement of two cylinders was next investigated by fixing the spacing ratio of one side of the cylinders at 5.0D and the other side at 3.0D, in which D represents the diameter of the cylinder. For the unparallel disposition, the 5.0D side showed a small, limited vibration while the 3.0D side produced much larger amplitude of vibration, resulting in a rolling motion. However, the overall amplitude appeared to decrease in unparallel disposition when compared with the amplitude of the 3.0D - 3.0D parallel case. This represents the mitigation effect of wake galloping due to the unparallel disposition between two cylinders. Flow visualization tests with particle image velocimetry were conducted to identify flow fields between two cylinders. The test results demonstrate the existence of a complex interaction of the downstream cylinder with the shear layer generated by the upstream cylinder. When the spacing ratio was large enough, the shear layer was not observed and the downstream cylinder showed only limited random vibration.

키워드

참고문헌

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  2. Wind tunnel study of wake-induced aerodynamics of parallel stay-cables and power conductor cables in a yawed flow vol.30, pp.6, 2020, https://doi.org/10.12989/was.2020.30.6.617
  3. Aerodynamic Characteristics of Coupled Twin Circular Bridge Hangers with Near Wake Interference vol.11, pp.9, 2014, https://doi.org/10.3390/app11094189