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Research Papers: CFD and VIV

Improved In-Line Vortex-Induced Vibrations Prediction for Combined In-Line and Cross-Flow Vortex-Induced Vibrations Responses

[+] Author and Article Information
Decao Yin

SINTEF Ocean,
Trondheim NO-7052, Norway
e-mail: decao.yin@sintef.no

Elizabeth Passano

SINTEF Ocean,
Trondheim NO-7052, Norway

Carl M. Larsen

SINTEF Ocean/NTNU,
Trondheim NO-7052, Norway

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 April 27, 2017; final manuscript received October 16, 2017; published online December 22, 2017. Assoc. Editor: Luis V. S. Sagrilo.

J. Offshore Mech. Arct. Eng 140(3), 031802 (Dec 22, 2017) (8 pages) Paper No: OMAE-17-1068; doi: 10.1115/1.4038350 History: Received April 27, 2017; Revised October 16, 2017

Slender marine structures are subjected to ocean currents, which can cause vortex-induced vibrations (VIV). Accumulated damage due to VIV can shorten the fatigue life of marine structures, so it needs to be considered in the design and operation phase. Semi-empirical VIV prediction tools are based on hydrodynamic coefficients. The hydrodynamic coefficients can either be calculated from experiments on flexible beams by using inverse analysis or theoretical methods, or obtained from forced motion experiments on a circular cylinder. Most of the forced motion experiments apply harmonic motions in either in-line (IL) or crossflow (CF) direction. Combined IL and CF forced motion experiments are also reported. However, measured motions from flexible pipe VIV tests contain higher order harmonic components, which have not yet been extensively studied. This paper presents results from conventional forced motion VIV experiments, but using measured motions taken from a flexible pipe undergoing VIV. The IL excitation coefficients were used by semi-empirical VIV prediction software vivana to perform combined IL and CF VIV calculation. The key IL results are compared with Norwegian Deepwater Programme (NDP) flexible pipe model test results. By using present IL excitation coefficients, the prediction of IL responses for combined IL and CF VIV responses is improved.

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References

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Figures

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Fig. 1

Illustration of application of measured nonperiodic and periodic orbits in forced motion VIV tests

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Fig. 2

Sketch and photos of test setup of forced motion VIV tests in NTNU MC-Lab

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Fig. 3

Default IL coefficients for a combination of CF and IL responses in VIVANA 4.8

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Fig. 4

IL coefficients obtained from forced motion VIV experiments using realistic orbits from NDP high mode VIV model tests

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Fig. 5

The IL excitation coefficient curve at single nondimensional frequency in VIVANA [3]

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Fig. 6

Modified IL coefficients obtained from forced motion VIV experiments using realistic orbits from NDP high mode VIV model tests

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Fig. 7

Dominating IL mode comparison, shear flow cases

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Fig. 8

Dominating IL mode comparison, uniform flow cases

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Fig. 9

Maximum standard deviation of IL displacement along the pipe, normalized by the outer diameter, shear flow cases

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Fig. 10

Maximum standard deviation of IL displacement along the pipe, normalized by the outer diameter, uniform flow cases

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Fig. 11

Nondimensional frequencies of uniform flow cases in the modified IL excitation coefficient contour plot

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Fig. 12

Spatial average of standard deviation of IL stress, shear flow cases

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Fig. 13

Spatial average of standard deviation of IL stress, uniform flow cases

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