An experiment study of vortex induced vibration of a steel catenary riser under steady current
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Available online at https://link.springer.com/journal/42241 http://www.jhydrodynamics.com Journal of Hydrodynamics, 2020, 32(5): 834-844 https://doi.org/10.1007/s42241-020-0067-4
An experiment study of vortex induced vibration of a steel catenary riser under steady current * Tie Ren1, 2, 3, Yu-wang Xu1, 2, Jungao Wang4, Hao-jie Ren1, 2, Meng-meng Zhang1, 2, Shi-xiao Fu1, 2, Yao-song Chen3 1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 2. Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China 3. Marine Design and Research Institute of China, Shanghai 200011, China 4. Norweigian Public Road Administration, Stavanger, Norway (Received April 15, 2019, Revised August 21, 2019, Accepted September 5, 2019, Published online October 29, 2020) ©China Ship Scientific Research Center 2020 Abstract: The vortex induced vibration (VIV) of marine risers has been investigated by many researchers in experimental studies of a straight flexible riser model as well as a rigid cylinder to reveal the dynamic response characteristic and the mechanics behind it. However, due to the limitation of experimental apparatus, very few studies are about the VIV of a steel catenary riser (SCR) which is with a complex geometry. To investigate the VIV features and to further develop the corresponding numerical predictions of a SCR under steady current, a large-scale model test of a SCR was towed in an ocean basin at various speeds. Fiber Bragg grating strain sensors are instrumented on the riser model to measure both in-plane and out-of-plane responses. The characteristics of oscillating amplitude and dominating frequency response, the phenomenon of mode competition and travelling wave and the fatigue damage of the steel catenary riser in inline and cross-flow direction under steady current are analyzed. Key words: Vortex induced vibration (VIV), steel catenary riser (SCR), experimental study
Introduction As the offshore oil exploitation moves to deep sea gradually, the widely used steel catenary riser (SCR) that connects the floating platform and the oil under the seabed becomes increasingly longer and slender. Vortex shedding behind the riser periodically can induce a quite large response as the shedding frequency is locked with one of the natural frequencies of the marine riser. Therefore, the prediction of vortex induced vibration (VIV) and the induced fatigue damage have attracted tremendous attention from both academia and engineering. In the last decades, experimental investigations on the VIV of a rigid riser section model and a straight flexible riser model are conducted quite frequently. Feng conducted a famous free oscillation experiment of an elastically supported rigid cylinder with high * Project supported by the National Natural Science Foundation of China (Grant Nos. 51490674, 51825903). Biography: Tie Ren (1985-), Male, Master, E-mail: [email protected] Corresponding author: Meng-meng Zhang, E-mail: [email protected]
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