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Research Papers: CFD and VIV

Study on Multimode Vortex-Induced Vibration of Deepwater Riser in Different Flow Fields by Finite Element Simulations

[+] Author and Article Information
Weimin Chen

Key Laboratory of Mechanics in Fluid
Solid Coupling System,
Institute of Mechanics,
Chinese Academy of Sciences,
Beijing 100190, China
e-mail: wmchen@imech.ac.cn

Min Li

School of Aeronautics Sciences and Engineering,
Beijing University of Aeronautics and Astronautics,
Beijing 100191, China
e-mail: limin@buaa.edu.cn

Liwu Zhang

Key Laboratory of Mechanics in Fluid
Solid Coupling System,
Institute of Mechanics,
Chinese Academy of Sciences,
Beijing 100190, China

Tiancai Tan

School of Aeronautics Sciences and Engineering,
Beijing University of Aeronautics and Astronautics,
Beijing 100191, China

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received October 12, 2011; final manuscript received September 16, 2015; published online October 29, 2015. Editor: Solomon Yim.

J. Offshore Mech. Arct. Eng 138(1), 011801 (Oct 29, 2015) (8 pages) Paper No: OMAE-11-1091; doi: 10.1115/1.4031729 History: Received October 12, 2011; Revised September 16, 2015

Multimode vortex-induced vibration (VIV) of slender risers, respectively, in stepped and shear flows is explored by finite element simulations. Taking account of the interaction between fluid and structure, a hydrodynamic model is proposed and embedded into the finite element simulation so as to carry out dynamic response of multimode VIV in time-domain. Multimode VIV in both stepped and shear flow fields is examined. In the case of stepped flow, a semi-empirical formula of modal weight is given. In the case of shear flow, modal excitation region can be determined based on modal energy, and participating modes approximately distribute in scattering groups.

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References

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Figures

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Fig. 2

The displacement response of a rigid cylinder vibrating in a manner of single-mode in uniform flow, the upper line indicates the amplitude of the experimental displacement

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Fig. 3

Comparisons between the presented numerical results and the experimental results of a flexible cylinder vibrating in a manner of single-mode, involving mode 3, in uniform flow: (a) the curve of RMS displacement along riser length and (b) the temporal–spatial evolution of displacement

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Fig. 4

Comparisons between the presented numerical results and the experimental results of a flexible cylinder vibrating in a manner of single-mode, involving modes 3 and 4, in uniform flow: (a) the curve of RMS displacement along riser length and (b) the temporal–spatial evolution of displacement

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Fig. 5

The experiment of a flexible riser in the stepped flow by Chaplin et al. [16]

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Fig. 6

Effect of reduced velocity on the modal weight

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Fig. 7

VIV amplitude of flexible riser experiencing stepped flow by numerical simulation (the left four plots at different time steps) and experiment (the last one by Chaplin et al. [16])

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Fig. 8

Experiment of flexible riser experiencing shear flow [13]

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Fig. 9

RMS displacement of flexible riser in shear flow: (a) 0.54 m/s towing speed and (b) 1.14 m/s towing speed

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Fig. 10

Length of lock-in region for participating modes: (a) 0.54 m/s towing speed and (b) 1.14 m/s towing speed

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