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

Chen, Weimin; Li, Min; Zhang, Liwu; Tan, Tiancai

doi:10.1115/1.4031729

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…Different from the originally constant lift coefficient C L , i.e. f L ¼ ð1=2ÞρV 2 C L D, new approaches of lift force were proposed (Chen et al, 2016;Sarpkaya, 2004;Vandiver and Li, 1999), which depend on body motion during lock-in. Because the coupling between structural and fluid dynamics were taken into accounts, these new approaches are more accurate and reasonable.…”

Section: Structural Finite Element Modelmentioning

confidence: 99%

“…ranging among ð0:3 $ 2:0Þ Â 10 6 ) the nonlinear expression with respect to structural motion is more reasonable. Here, the third-order polynomial of the structure velocity originally suggested by Chen (Chen et al, 2016) is used to model the lift coefficient as follow…”

Section: Structural Finite Element Modelmentioning

confidence: 99%

“…Moreover, the shedding mode or frequency of wake vortex may vary, or even be grouped in cells, along structural span due to span-wise coupling of vortices (Mukhopadhyay et al, 1999;Lucor et al, 2001;Williamson and Govardhan, 2008). Therefore, VIV of a long flexible riser experiencing non-uniform flow often presents new phenomena such as multi-frequency (or called as multi-mode) VIV, travelling wave and wide-band random vibrations (Chen et al, 2016;Violette et al, 2010;Sarpkaya, 2004;Facchinetti, 2004;Huera-Huarte and Bearman, 2009). Since natural frequencies of slender riser are dense, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Analysis on multi-frequency vortex-induced vibration and mode competition of flexible deep-ocean riser in sheared fluid fields

Guo

Chen

2018

Journal of Petroleum Science and Engineering

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A B S T R A C TMulti-frequency vortex-induced vibration of flexible riser in lineally sheared fluid fields with different shearing parameters is explored by using the numerical approach. By combining the finite element method with a hydrodynamic model, the approach can consider mode competition based on modal energy and can carry out nonlinearly simultaneously dynamic response in time domain. Our analysis shows that multi-frequency VIV may occur both in non-uniform and uniform fluid fields. And, the behaviors of multi-frequency VIV are different from single-frequency VIV. Because several modes are involved and compete with each other, and consequently the determination of modal excitation region become more complicated. As the towing speed (or the shearing parameter) increases in sheared flow, the average RMS displacement does not regularly rise (or drop), but slightly fluctuates owing to changes of the participating mode and its excitation region. On the other hand, the average RMS stress gradually rises owing to higher-order modes being included. Moreover, it is found that the dominant frequency distributing along structural span significantly changes with the towing speed, and the length of the first dominant frequency gets smaller due to larger shearing parameter along with more intense competition between the participating modes.

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Section: Structural Finite Element Modelmentioning

confidence: 99%

Section: Structural Finite Element Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis on multi-frequency vortex-induced vibration and mode competition of flexible deep-ocean riser in sheared fluid fields

Guo

Chen

2018

Journal of Petroleum Science and Engineering

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“…Most of researches applied pinned-pinned boundary conditions [3,8]. But some have assumed clamped type [9,10].…”

Section: Introductionmentioning

confidence: 99%

On the selection of boundary conditions for top tensioned risers facing wave induced vibrations

Haghayeghi¹,

Ketabdari²

2018

J. vibroeng.

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Abstract. The severe ocean environment is obviously the source of many uncertain random loads on offshore structures. This harsh environment when acting on the slender top tensioned risers with high aspect ratio (L/D) causes multimodal vibration leading to fatigue failure. Thus, a reliable stress analysis procedure should be applied in the assessment of their long-term behaviors. This research is a study on the effect of boundary conditions on the total and local response of offshore risers due to loads in different sea states. A FEM code is developed for discretization of riser's structural model and was run for the riser of Amirkabir semisubmersible vessel for 87 sea states in the Caspian Sea and four boundary conditions. The results show that the most severe stresses in the riser don't happen essentially in the harshest environment. The comparison of boundary conditions shows that clamped-clamped boundaries lead to lowest stress values while the riser experiences a wider band of stress in the pinned-pinned boundary type. While the riser top end boundary condition highly influences the displacements and stresses even in the lower part of riser.

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Response of a submerged floating tunnel subject to flow-induced vibration

Zou

Bricker

Chen³

et al. 2022

Engineering Structures

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

Cited by 5 publications

References 21 publications

Analysis on multi-frequency vortex-induced vibration and mode competition of flexible deep-ocean riser in sheared fluid fields

Analysis on multi-frequency vortex-induced vibration and mode competition of flexible deep-ocean riser in sheared fluid fields

On the selection of boundary conditions for top tensioned risers facing wave induced vibrations

Response of a submerged floating tunnel subject to flow-induced vibration

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