Fatigue damage of a steel catenary riser from vortex-induced vibration caused by vessel motions

An investigation into the hydrodynamics of a flexible riser undergoing vortex-induced vibration

“…Therefore, the FBG strain sensors would not affect the flow around the vibrating riser and the vibration characteristics of the flexible riser. As a mature technology, FBG strain sensor techniques have been successfully used in many VIV model tests of flexible risers Fang et al, 2014;Li et al, 2011;Wang et al, 2014). Four FBG strain sensors were placed on 4 points of the opposite sides of a cross section denoted as CF1, CF2, IL1 and IL2, as shown in Fig.…”

Experimental investigation on the dynamic responses of a free-hanging water intake riser under vessel motion

“…This phenomenon occurs because the riser will be exposed to the oscillatory flow due to its relative motion with respect to the water particles around. According to the experimental investigations, vessel motion-induced VIV for the compliant risers is characterized with strong time-varying features, which is recognized as one of the major differences compared to VIV under ocean current [20]. Meanwhile, maximum KC number and maximum in-plane velocity are found to be the two dominant parameters governing vessel motion-induced VIV features when maximum KC number is large enough (larger than 40 typically [20]).…”

VIV response of a long flexible riser fitted with strakes in uniform and linearly sheared currents

“…The problem caused by vortex-induced vibration (VIV) has led to a large number of experimental and numerical studies [1][2][3][4][5][6][7][8][9][10][11]. When the vortex shedding frequency is close to the structural frequency, the lock-in (synchronisation) phenomenon occurs, and a riser may experience great fatigue damage induced by a high oscillated vibration amplitude, which should be suppressed.…”