In order to study vortex induced motions (VIM) response of a floating cylinder, its model tests were performed in a water flume under the reduced velocity range of 1.3 to 10.2. Considering the aspects of response amplitude and vortex shedding frequency, VIM responses of the cylinder with and without helical strakes were measured. It was shown that for the cylinder without helical strakes, “lock in” phenomena occur under the reduced velocity range of 5.5 to 8; after adding to the cylinder helical strakes to the cylinder, the effect of suppressing VIM is obvious and the phenomena of “lock in” are not obvious; under fluid-structure interaction, the VIM sway frequency of the cylinder is on longer coincident with the varying law of Strouhal frequency.
Key words
floating cylinder /
vortex induced motions /
model test /
fluid-structure interaction
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