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VIV DEVELOPING PROCESS OF A FLEXIBLE CYLINDER UNDER OSCILLATORY FLOW
Author(s): Wang Jungao, Fu Shixiao, Xu Yuwang, Song Leijian, State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University
Pages: 173-
182
Year: 2014
Issue:
2
Journal: Chinese Journal of Theoretical and Applied Mechanics
Keyword: VIV developing process; oscillatory flow; flexible cylinder; maximum reduced velocity;
Abstract: Offshore floating structures would bring the catenary risers moving in the water periodically under sea loads, then to generate relatively oscillatory flow between the riser and the water particles. Such oscillatory flow would easily trigger the "intermittent VIV" at sag-bend of the catenary riser. Experimental investigations on the behaviors of a 4 m long straight flexible cylinder in the relatively oscillatory flow were carried out in this paper by forcing it oscillating with different combinations of both maximum reduced velocity UR maxand Keulegan--Carpenter number(KC) in still water. Fiber brag grating(FBG) strain sensors were used to measure the VIV responses of the model cylinder. Meanwhile, modal analysis was adopted to process the experimental data, and three VIV developing process in oscillatory flow including "building-up", "locking-in" and "dying-out" were firstly proposed. Furthermore, effects on VIV in oscillatory flow from both reduced velocity UR max and KC were discussed and summarized. Finally, normalized time ratio contour plots of three VIV developing phases in different maximum reduced velocities were obtained.
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