Hostname: page-component-7dd5485656-dk7s8 Total loading time: 0 Render date: 2025-10-31T13:49:19.961Z Has data issue: false hasContentIssue false
  • English
  • Français

Vortex excitation of rectangular cylinders with a long side normal to the flow

Published online by Cambridge University Press:  21 April 2006

Yasuharu Nakamura  and
Tohru Matsukawa
Yasuharu Nakamura
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816, Japan
Tohru Matsukawa
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816, Japan
Get access Rights & Permissions [Opens in a new window]

Abstract

The vortex excitation of rectangular cylinders having side ratios of 0.2, 0.4 and 0.6, with a long side normal to the flow, in a mode of lateral translation, is investigated experimentally in a wind tunnel using free- and forced-oscillation methods. The range of reduced wind speeds investigated, 3-12, includes the vortex-resonance regime. The forced-oscillation experiment includes measurements of the fluctuating lift force at amplitudes up to 10% of the length of a long side. The experiments were also performed on cylinders with a long fixed splitter plate. The results of the measurements show that vortex excitation of a rectangular cylinder is strongly dependent on the side ratio. It is suggested that the critical change of the mean base pressure of an oscillating rectangular cylinder with increasing side ratio is closely correlated with the vortex-excitation characteristics. The concept of vortex excitation as aeroelastic flutter occurring in a fluid-body coupled system is proposed on the basis of the experimental results. The most essential feature of vortex excitation as a coupled flutter is that the fluid subsystem can be set into resonance by the body motion. A rapid phase-angle change in the lift force through vortex resonance produces a large out-of-phase force component which excites the motion of the body subsystem.

Information

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 180 , July 1987 , pp. 171 - 191
Copyright
© 1987 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

Bearman, P. W. 1984 Ann. Rev. Fluid Mech. 16, 195–222.
Bearman, P. W. & Currie, I. G. 1979 J. Fluid Mech. 91, 661–677.
Bearman, P. W. & Obasaju, E. D. 1982 J. Fluid Mech. 119, 297–321.
Bearman, P. W. & Trueman, D. M. 1972 Aero Q. 23, 229–237.
Feng, C. C. 1968 MASc. thesis, Faculty of Engineering, University of British Columbia, Canada.
Ito, M. & Nakamura, Y. 1982 IABSE Surveys S-20/82. International Association for Bridge and Structural Engineering.
Mizota, T. 1984 Doctoral thesis, Faculty of Engineering, Kyushu University, Japan (in Japanese).
Nakaguchi, H., Hashimoto, K. & Muto, S. 1968 J. Japan. Soc. Aero. Space Sci. 16, 1–5 (in Japanese).
Nakamura, Y. 1978 J. Sound Vib. 57, 471–482.
Nakamura, Y. 1979 J. Sound Vib. 67, 163–177.
Nakamura, V. & Mizota, T. 1975 J. Eng. Mech. Div. ASCE 101, (EM6) 855–871.
Nakamura, V. & Nakashima, M. 1986 J. Fluid Mech. 163, 149–169.
Nakamura, V. & Ohya, Y. 1984 J. Fluid Mech. 149, 255–273.
Nakamura, V. & Tomonari, Y. 1977 J. Sound Vib. 52, 233–241.
Otsuki, Y., Washizu, K., Tomizawa, H. & Ohya, A. 1974 J. Sound Vib. 34, 233–248.
Sarpkaya, T. 1979 Trans. ASME E: J. Appl. Mech. 46, 241–258
Stuart, J. T. 1971 Mathematical Problems in Geophysical Sciences. Lectures in Applied Mathematics, vol. 13, pp. 139–155. American Math. Soc.
Washizu, K., Ohya, A., Otsuki, Y. & Fujii, K. 1978 J. Sound Vib. 59, 195–210.
Wilkinson, R. H. 1974 Ph.D. thesis, Faculty of Engineering, University of Bristol, England.
Zdravkovich, M. M. 1982 Trans. ASME I: J. Fluids Engng 104, 513–517