Wind and Structures

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Numerical study of the effect of periodic jet excitation on cylinder aerodynamic instability

  • Hiejima, S. (Department of Environmental & Civil Engineering, Faculty of Environmental Science and Technology, Okayama University) ;
  • Nomura, T. (Department of Civil Engineering, College of Science and Technology, Nihon University)
  • Published : 2002.04.25
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Abstract

Numerical simulations based on the ALE finite element method are carried out to examine the aerodynamics of an oscillating circular cylinder when the separated shear flows around the cylinder are stimulated by periodic jet excitation with a shear layer instability frequency. The excitation is applied to the flows from two points on the cylinder surface. The numerical results showed that the excitation with a shear layer instability frequency can reduce the negative damping and thereby stabilize the aerodynamics of the oscillating cylinder. The change of the lift phase seems important in stabilizing the cylinder aerodynamics. The change of lift phase is caused by the merger of the vortices induced by the periodic excitation with a shear layer instability frequency, and the vortex merging comes from the high growth rate, the rapid increase of wave number and decrease of phase velocity for the periodic excitation in the separated shear flows.

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References

  1. Ahuja, K.K., et al. (1983), "Control of turbulent boundary layer flows by sound", AIAA Paper, 83-0726.
  2. Ahuja, K.K. and Burrin, R.H. (1984), "Control of flow by sound", AIAA Paper, 84-2298.
  3. Blevins, R.D. (1990), Flow-Induced Vibration, Van Nostrand Reinhold, New York.
  4. Bloor, M.S. (1964), "The transition to turbulence in the wake of a circular cylinder", J. Fluid Mech., 19, 290-304. https://doi.org/10.1017/S0022112064000726
  5. Brooks, A.N., et al. (1982), "Streamline upwind/Petrov-Galerkin formulations for convection dominated flows with particular emphasis on the incompressible Navier-Stokes equation", Comput. Meths. Appl. Mech. Engrg., 32, 199-259. https://doi.org/10.1016/0045-7825(82)90071-8
  6. Gaster, M. (1965), "On the generation of spatially growing waves in a boundary layer", J. Fluid Mech., 22, 433-441. https://doi.org/10.1017/S0022112065000873
  7. Hiejima, S. et al., (1995), "An experimental study on the effect of applied sound on the vortex-induced vibration of a circular cylinder", Proc. EASEC-5, 1231-1236.
  8. Hiejima, S. et al., (1996), "An experimental study on the control of the vortex-induced vibration of a circular cylinder by acoustic excitation", Struct. Eng./Earthquake Eng. (JSCE), 13(1), 67s-72s.
  9. Hiejima, S. et al., (1997), "Numerical study on the suppression of the vortex-induced vibration of a circular cylinder by acoustic excitation", J. Wind Eng. Ind. Aerod., 67 & 68, 325-335.
  10. Hsiao, F.B. et al., (1989), "Experimental study of an acoustically excited flow over a circular cylinder", Transport Phenomena in Thermal Control (ed. G. J. Hwang), New Youk : Hemisphere, 537-546.
  11. Hsiao, F.B. et al., (1990), "Control of wall-separated flow by internal acoustic excitation", AIAA Journal, 28, 1440-1446. https://doi.org/10.2514/3.25236
  12. Hsiao, F.B. and Shyu, J.Y. (1991), "Influence of internal acoustic excitation upon flow passing a circular cylinder", J. Fluids Struct., 5, 427-442. https://doi.org/10.1016/0889-9746(91)90429-S
  13. Hughes, T.J.R. (1987), The Finite Element Method, Prentice-Hall, New Jersey.
  14. Michalke, A. (1965), "On spatially growing disturbances in an inviscid shear layer", J. Fluid Mech., 23, 521-544. https://doi.org/10.1017/S0022112065001520
  15. Naudascher, E. and Rockwell, D. (1994), Flow-Induced Vibrations, A. A. Balkema, Rotterdam, Netherlands.
  16. Nishioka, M. et al., (1990), "Control of flow separation by acoustic excitation", AIAA Journal, 28(11), 1909-1915. https://doi.org/10.2514/3.10498
  17. Nomura, T. et al., (1992), "An arbitrary Lagrangian-Eulerian finite element method for interaction of fluid and a rigid body", Comput. Meths. Appl. Mech. Engrg., 95, 115-138. https://doi.org/10.1016/0045-7825(92)90085-X
  18. Nomura, T. (1993), "Finite element analysis of vortex-induced vibrations of bluff cylinder", J. Wind Eng. Ind. Aerod., 46 & 47, 587-594.
  19. Nomura, T. (1994), "ALE finite element computations of fluid-structure interaction problems", Comput. Meths. Appl. Mech. Eng., 112, 291-308. https://doi.org/10.1016/0045-7825(94)90031-0
  20. Okamoto, S. et al. (1981), "The effect of sound on the vortex-shedding from a circular cylinder", Bull. JSME, 24(187), 45-53. https://doi.org/10.1299/jsme1958.24.45
  21. Peterka, J.A. and Richardson, P.D. (1969), "Effect of sound on separated flows", J. Fluid Mesh., 37(2), 265-287. https://doi.org/10.1017/S0022112069000541
  22. Sheridan, J. et al. (1992), "The Kelvin-Helmholtz instability of the separated shear layer from a circular cylinder", Proc. IUTAM Symp. on Bluff-Body Wakes, Dynamics and Instabilities (ed. H. Eckelmann et al.), Berlin : Springer-Verlag, 115-118.
  23. Zaman, K. B. M. Q. et al. (1987), "Effect of acoustic excitation on the flow over a low-Re air-foil", J. Fluid Mech., 182, 127-148. https://doi.org/10.1017/S0022112087002271
  24. Zaman, K. B. M. Q. and McKinzie, D.J. (1991), "Control of laminar separation over airfoils by acoustic excitation", AIAA Journal, 29, 1075-1083. https://doi.org/10.2514/3.10706
  25. Zaman, K. B. M. Q. (1992), "Effect of acoustic excitation on stalled flows over an airfoil", AIAA Journal, 30, 1492-1499. https://doi.org/10.2514/3.11092
  26. Zobnin, A.B. and Sushchik, M.M. (1989), "Influence of a high-frequency sound field on vortex-generation in the wake of a cylinder", Sov. Phys. Acoust., 35(1), 37-39.