Wind and Structures

  • 제38권1호
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  • Pages.59-74
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  • 2024
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Effects of oscillation parameters on aerodynamic behavior of a rectangular 5:1 cylinder near resonance frequency

  • Pengcheng Zou (State Key Lab of Disaster Reduction in Civil Engineering, Tongji University) ;
  • Shuyang Cao (State Key Lab of Disaster Reduction in Civil Engineering, Tongji University) ;
  • Jinxin Cao (State Key Lab of Disaster Reduction in Civil Engineering, Tongji University)
  • 투고 : 2023.08.27
  • 심사 : 2023.12.05
  • 발행 : 2024.01.25
⟨ 이전 논문 다음 논문 ⟩

초록

Large Eddy Simulation (LES) is used to explore the influence of vibration frequency and amplitude on the aerodynamic performance of a rectangular cylinder with an aspect ratio of B/D=5 (B: breadth; D: depth of cylinder) at a Reynolds number of 22,000 near resonance frequency. In smooth flow conditions, the research employs a sequence of three-dimensional simulations under forced vibration with diverse frequency ratios fe / fo = 0.8-1.2 (fe : oscillation frequency; fo : Strouhal frequency when the rectangular cylinder is stationary ) and oscillation amplitudes Ah/D = 0.05 - 0.3. The individual influences of fe / fo and Ah/D on the characteristics of integrated and distributed aerodynamic forces are the focal points of discussion. For the integrated aerodynamic force, particular emphasis is placed on the analysis of the dependence of velocity-proportional component C1 and displacement-proportional component C2 of unsteady aerodynamic force on amplitude and frequency ratio. Near the resonance frequency, the dependencies of C1 and C2 on amplitude are stronger than that of frequency ratio. For the distributed aerodynamic force, the increase in frequency and amplitude promotes the position of the main vortex core and reattachment to the leading edge in the streamwise direction. In the spanwise direction, vibration enhances the spanwise correlation of aerodynamic force to weaken the three-dimensional effect of the flow field, and a lower frequency ratio and larger amplitude amplify this effect.

키워드

과제정보

The Natural Science Foundation of China (NSFC) Grant No. 52078382 and the State Key Laboratory of Disaster Reduction in Civil Engineering Grant No. SLDRCE19-A-01 are gratefully acknowledged as the funding sources for this study.

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