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Characteristics of fluctuating lift forces of a circular cylinder during generation of vortex excitation

  • Kim, Sangil (Department of Mechanical Engineering, Kitami Institute of Technology) ;
  • Sakamoto, Hiroshi (Department of Mechanical Engineering, Kitami Institute of Technology)
  • Received : 2005.06.24
  • Accepted : 2006.02.03
  • Published : 2006.04.25
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Abstract

This paper describes the characteristics of the fluctuating lift forces when a circular cylinder vibrates in the cross-flow direction. The response characteristics on elastically supported the circular cylinder was first examined by a free-vibration test. Next, flow-induced vibrations obtained by the free-vibration test were reproduced by a forced-vibration test, and then the characteristics of the fluctuating lift forces, the work done by the fluctuating lift, the behavior of the rolling-up of the separated shear layers were investigated on the basis of the visualized flow patterns. The main findings were that (i) the fluctuating lift forces become considerably large than those of a stationary circular cylinder, (ii) negative pressure generates on the surface of the circular cylinder when the rolling-up of separated shear layer begins, (iii) the phase between the fluctuating lift force and the cylinder displacement changes abruptly as the reduced velocity $U_r$ increases, and (iv) whether the generating cross-flow vibration becomes divergent or convergent can be described based on the work done by the fluctuating lift force. Furthermore, it was found that the generation of cross-flow vibration can be perfectly suppressed when the small tripping rods are installed on the surface of the circular cylinder.

Keywords

References

  1. Anagnostopoulos, P. and Beannan, P.W. (1992), 'Response characteristics of a vortex-excited cylinder at low Reynolds numbers', J. Fluids Struct., 6, 39-50 https://doi.org/10.1016/0889-9746(92)90054-7
  2. Bishop, R.E.D. and Hassan, A.Y. (1964), 'The lift and drag forces on a circular cylinder oscillating in a flowing fluid', Proceedings of the Royal Society ofLondon. Series A, 277, 51-75
  3. Beannan, P.W. and Currie, I.G. (1979), 'Pressure-fluctuation measurements on an oscillating circular cylinder', J. Fluid Mech., 91-4, 661-677
  4. Brika, D. and Laneville, A. (1993), 'Vortex-induced vibrations of a long flexible circular cylinder', J. Fluid Mech., 250, 481-508 https://doi.org/10.1017/S0022112093001533
  5. Carberry, J., Sheridan, J., and Rockwell, D. (2001), 'Forces and wake modes of an oscillating cylinder', J. Fluids Struct., 15, 523-532 https://doi.org/10.1006/jfls.2000.0363
  6. Govardhan, R. and Williamson, C.H.K. (2000), 'Modes of vortex formation and frequency response of a freely vibrating cylinder', J. Fluid Mech., 420,85-130 https://doi.org/10.1017/S0022112000001233
  7. Griffin, O.M. and Ramberg, S.E. (1974), 'The vortex wakes of vibrating cylinders', J. Fluid Mech., 66, 553-576 https://doi.org/10.1017/S002211207400036X
  8. Gu, W., Chyu, C., and Rockwell, D. (1994), 'Timing of vortex formation from an oscillating cylinder', Physics Fluids, 6-11, 3677-3682
  9. Hover, F.S., Techet, A.H., and Triantafyllou, M.S. (1998), 'Forces on oscillating uniform and tapered cylinders in crossflow', J. Fluid Mech., 363, 97-114 https://doi.org/10.1017/S0022112098001074
  10. Khalak, A and Williamson, C.H.K. (1999), 'Motions, forces and mode transitions in vortex-induced vibrations at low mass-damping', J. Fluids Struct' 13, 813-851 https://doi.org/10.1006/jfls.1999.0236
  11. Moe, G. and Wu, Z.J. (1990), 'The lift force on a cylinder vibrating in a current', J. Offshore Mech. Arctic Eng., ASME, 112,297-303 https://doi.org/10.1115/1.2919870
  12. Okajima, A., Nagamori, T., Matsunaga, E, and Kiwata, T. (1999), 'Some experiments on flow-induced vibration of a circular cylinder with surface roughness', J. Fluids Struct., 13, 853-864 https://doi.org/10.1006/jfls.1999.0241
  13. Okamoto, S., Uematsu, R., and Taguwa, Y. (2001), 'Fluid force acting on two-dimensional circular cylinder in lock-in phenomenon', Transactions of the Japan Society of Mechanical Engineers, B67-654, 430-435 (in Japanese)
  14. Ongoren, A and Rockwell, D. (1988), 'Flow structure from an oscillating cylinder Part 1. Mechanisms of phase shift and recovery in the near wake', J. Fluid Mech., 91,197-223
  15. Sarpkaya, T. (1979), 'Vortex-induced oscillation: A selective review', Transactions of ASME, J. Appl. Mech., 46, 241-258 https://doi.org/10.1115/1.3424537
  16. Shiels, A.L. and Roshko, A (2001), 'Flow-induced vibration of a circular cylinder at limiting structural parameters', J. Fluids Struct., 15,3-21 https://doi.org/10.1006/jfls.2000.0330
  17. Tan, K., Moriya, M., and Sakamoto, H. (2003), 'Suppression of fluid forces acting on circular cylinder by tripping rods', Transactions of the Japan Society of Mechanical Engineers, B 69-679,574-578 (in Japanese)
  18. Williamson, C.H.K. and Roshko, A (1988), 'Vortex formation in the wake of an oscillating cylinder', J. Fluids Struct., 2, 355-381 https://doi.org/10.1016/S0889-9746(88)90058-8
  19. Zdravkovich, M.M. (1997), Flow around Circular Cylinders, Vol. 1, Oxford University Press

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