WAVE FORCES ACTING ON A VORTEX EXCITED VIBRATING CYLINDER IN WAVES

Kenjiro Hayashi, Futoshi Hagaki, Koji Fujima, Toshiyuki Sigemura, John R. Chaplin

Abstract


An experimental investigations into the wave forces acting on the vortex-excited vibrating vertical circular cylinder in regular waves have been performed with emphasis being placed on the amplification of the wave forces caused by the fluid-structure interaction. The cylinder is vibrating only in the transverse, cross-flow, direction by means of the restriction of the vibration of the in-line direction. The results indicate that the existence of amplification of the lift forces acting on the vortex-excited vibrating cylinder in comparison with the stationary cylinder is a function of the ratio of wave frequency fw to the natural frequency of the cylinder in water fnw and Keulegan-Carpenter number at still water level CKC. The in-line forces are also amplified in the range of CKC where large amplitude of oscillation in the transverse direction occurs.

Keywords


wave forces; vortex; cylinder

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