Vortex Shedding from a Cylinder Which Swings Steadily in a Fluid at Rest

Abstract

Fluid force and Karman-vortex induced by manipulators of marine robots tend to make control of the robots difficult. We regarded a cyl-inder as a manipulator of robot and observed flow past the cylinder ro-tated horizontally around a vertical axis through one side of it in order to show the behaviour of Karman-vortex shedding from it. We used hydrogen-bubble method and recorded the flow on videotape by a camera moving with the cylinder.
Strouhal number St based on peripheral velocity at outer end was obtained under some range of Reynolds number Re. that is. St= {-.7em}\ aisebox{1.1ex}{.} {.1em}\ aisebox{-0.2ex}{.}0.12 for 1.16×10³≤ Re≤ 4.13≤ 10³ and l/d=10. St= {-.7em}\ aisebox{1.1ex}{.} {.1em}\ aisebox{-0.2ex}{.}0.06 for 1.72×10³≤ Re≤ 4.76×103 and l/d=6.53. where l and d are length and diameter of the cylinder.