抄録
Vortex induced vibration is caused by the fluidic interaction in a circular cylinder. This phenomenon is influenced by the flow around the circular cylinder and vortex motions in this wake. In order to control this phenomenon, the suppression of the vortex shedding generated from a circular cylinder is conducted by the attaching spherical rings. In this paper, the flow behavior in the wake and the drag coefficients is measured using X type hotwire anemometer and three-components balance. As these results, the wake width and the drag coefficients decrease due to the flow toward the center of the cylinder behind these rings.
