Abstract
It is known that manipulators of marine robots are oscillated by Karman-vortex shed from themselves when they move in a water. To analyze fundamentally this, flows around a circular cylinder turned round its end have been visualized by means of hydrogen-bubble method in this study.
The separation vortices generated in the neighborhood of the other end of cylinder were periodically shed from it. The vortex shedding made continuously progress toward the center of rotation, and vortex filaments like ox-horn were formed. They were not continued to the center of rotation but broken off in the middle of the cylinder. The locations of breakaway point were scattered in every vortex shedding. Therefore the shedding frequency was higher in outer region than in inner.
