Flow around circular cylinder oscillating at low Keulegan-Carpenter number
- Univ. of Tokyo (Japan). Inst. of Industrial Science
This paper shows experimental results of hydrodynamic forces acting on a vertical circular cylinder oscillating sinusoidally at low frequencies in the still water and results of the flow visualization, to examine the flow around a circular cylinder, particularly the lift forces at low Keulegan-Carpenter number Kc. The instability of streaked flow of which section is mushroom shape is observed by flow visualization, and the flows are asymmetrical in some cases. The asymmetrical streaked flow may have a close relationship to the lift force at low Kc, Kc {le} 4 or 5. Asymmetrical mushroom vortex ring is visible for Kc {le} 1. The mushroom vortex ring is symmetrical, or the streaks of the rings arrange themselves alternately for 1 {le} Kc {le} 1.5. A clear ring of mushroom vortices is not formed due to diffusion of dye sheets, though a flow streaked with mushroom vortices is visible for 1.5 {le} Kc {le} 2.5 and for Kc {ge} 2.5 the flow is almost turbulent.
- OSTI ID:
- 404223
- Report Number(s):
- CONF-940409-; ISBN 1-880653-10-9; TRN: IM9652%%83
- Resource Relation:
- Conference: 4. international conference on offshore and polar engineering, Osaka (Japan), 10-15 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of The proceedings of the fourth (1994) international offshore and polar engineering conference. Volume 3; Chung, J.S. [ed.] [Colorado School of Mines, Golden, CO (United States)]; Maeda, Hisaaki [ed.] [Univ. of Tokyo (Japan)]; Naito, Shigeru [ed.] [Osaka Univ. (Japan)]; Ikeda, Yoshiho [ed.] [Univ. of Osaka Prefecture, Osaka (Japan)]; PB: 606 p.
- Country of Publication:
- United States
- Language:
- English
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