Numerical simulation on wake galloping of a downstream circular cylinder and aerodynamic forces analysis in staggered arrangement
CSTR:
Author:
Clc Number:

TM723

  • Article
  • | |
  • Metrics
  • |
  • Reference [19]
  • |
  • Related
  • | | |
  • Comments
    Abstract:

    It is difficult to obtain wake galloping forces in wind tunnel experiments, but it is easy to acquire them by Fluent numerical simulations. In this paper, wake galloping responses of a spring-mounted downstream circular cylinder, with two degree-of-freedom in the wake of a stationary one, were simulated in staggered arrangement at streamwise spacing ratio L/D=2 and cross-stream spacing ratio T/D=1. In combination of structured meshing methods in ICEM and dynamic mesh techniques, the simulation was performed by the proposed unsteady fluid-structure coupling method, which embeds user defined code into Fluent by adopting the unsteady SST k-ω model for the 2D Reynolds-Averaged Navier-stokes (2D RANS) model. The study was carried out with reduced velocities Vr varying from 5 to 60 and Reynolds numbers Re varying from 2.4×103 to 2.82×104. Vibration responses obtained by the proposed unsteady fluid-structure coupling method were validated by experimental data and the aerodynamic forces at Vr=50 were compared to that calculated by the quasi-steady calculation method. Results indicate that the dimensionless amplitude Ay/D increases nearly linearly with the increase of Vr as a typical wake galloping phenomenon. The amplitudes have an excellent agreement with the experimental data. The wake depresses the random vortex shedding of downstream cylinder in vortex-induced resonance region. The trajectory of the downstream cylinder appears like a counterclockwise tilted oval with a clear directivity and self-limitation in the wake galloping region. Additionally, the quasi-steady calculation method has insufficient consideration on higher-order forces and vortex-shedding forces. The displacements obtained by the two methods have an excellent agreement. The self-excitation forces of primary four order frequency multiplication play a major role in controlling the displacement response undergoing wake galloping, indicating that the wake galloping is a kind of self-induced vibration.

    Reference
    [1] 康庄, 张橙. 雷诺数对圆柱体涡激振动特性影响研究[J]. 华中科技大学学报(自然科学版), 2017, 45(11):74-79.Kang Z, Zhang C. Impact of Reynolds number on vortex-induced vibration performance of cylinder[J]. Journal of Huazhong University of Science and Technology (Natural Science Edition), 2017, 45(11):74-79.(in Chinese)
    [2] Morse T L, Govardhan R N, Williamson C H K. The effect of end conditions on the vortex-induced vibration of cylinders[J]. Journal of Fluids and Structures, 2008, 24(8):1227-1239.
    [3] 晏致涛, 王灵芝, 刘军, 等. 表面粗糙度对导线风荷载及涡激振动的影响[J]. 振动与冲击, 2018, 37(7):146-151.Yan Z T, Wang L Z, Liu J, et al. Effects of surface roughness of conductors on their wind loads and vortex-induced vibration[J]. Journal of Vibration and Shock, 2018, 37(7):146-151.(in Chinese)
    [4] 方平治, 顾明. 圆柱两自由度涡激振动的数值模拟研究[J]. 同济大学学报(自然科学版), 2008, 36(3):295-298.Fang P Z, Gu M. Numerical simulation for vortex-induced vibration of circular cylinder with two degree of feedoms[J]. Journal of Tongji University (Natural Science), 2008, 36(3):295-298.(in Chinese)
    [5] Khalak A, Williamson C H K. Motions, forces and mode transitions in vortex-induced vibrations at low mass-damping[J]. Journal of Fluids and Structures, 1999, 13(7/8):813-851.
    [6] Assi G R S, Bearman P W, Meneghini J R. On the wake-induced vibration of tandem circular cylinders:the vortex interaction excitation mechanism[J]. Journal of Fluid Mechanics, 2010, 661:365-401.
    [7] Assi G R S, Bearman P W, Carmo B S, et al. The role of wake stiffness on the wake-induced vibration of the downstream cylinder of a tandem pair[J]. Journal of Fluid Mechanics, 2013, 718:210-245.
    [8] Assi G R S. Wake-induced vibration of tandem and staggered cylinders with two degrees of freedom[J]. Journal of Fluids and Structures, 2014, 50:340-357.
    [9] Brika D, Laneville A. The flow interaction between a stationary cylinder and a downstream flexible cylinder[J]. Journal of Fluids and Structures, 1999, 13(5):579-606.
    [10] King R, Johns D J. Wake interaction experiments with two flexible circular cylinders in flowing water[J]. Journal of Sound and Vibration, 1976, 45(2):259-283.
    [11] Hover F S, Triantafyllou M S. Galloping response of a cylinder with upstream wake interference[J]. Journal of Fluids and Structures, 2001, 15(3/4):503-512.
    [12] Tokoro S, Komatsu H, Nakasu M, et al. A study on wake-galloping employing full aeroelastic twin cable model[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2000, 88(2/3):247-261.
    [13] Zdravkovich M M. Review of interference-induced oscillations in flow past two parallel circular cylinders in various arrangements[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1988, 28(1/2/3):183-199.
    [14] 方平治, 顾明, 谈建国, 等. 阻塞率对表面风压系数影响的数值模拟[J]. 建筑科学与工程学报, 2013, 30(3):101-106.Fang P Z, Gu M, Tan J G, et al. Numerical simulation of effect of blockage ratio on facade pressure coefficient[J]. Journal of Architecture and Civil Engineering, 2013, 30(3):101-106.(in Chinese)
    [15] Wu W S, Huang S, Barltrop N. Current induced instability of two circular cylinders[J]. Applied Ocean Research, 2002, 24(5):287-297.
    [16] 肖春云. 大跨度柔性桥梁双索股尾流驰振机理研究[D]. 长沙:湖南大学, 2016.Xiao C Y. The research on mechanism of double strands wake galloping of the long-span flexible bridge[D]. Changsha:Hunan University, 2016. (in Chinese)
    [17] Sockel H, Watzinger J. Vibrations of two circular cylinders due to wind-excited interference effects[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1998, 74/75/76:1029-1036.
    [18] Qin B, Alam M M, Zhou Y. Free vibrations of two tandem elastically mounted cylinders in crossflow[J]. Journal of Fluid Mechanics, 2019, 861:349-381.
    [19] Wu W B, Wang J S. Numerical simulation of VIV for a circular cylinder with a downstream control rod at low Reynolds number[J]. European Journal of Mechanics-B/Fluids, 2018, 68:153-166.
    Related
    Cited by
    Comments
    Comments
    分享到微博
    Submit
Get Citation

傅亨仁,王灵芝,晏致涛,孙毅.错列布置下游圆柱尾流驰振特性的数值模拟与荷载分析[J].重庆大学学报,2022,45(9):73~82

Copy
Share
Article Metrics
  • Abstract:
  • PDF:
  • HTML:
  • Cited by:
History
  • Received:December 05,2021
  • Online: October 10,2022
Article QR Code