Blind predictions of laboratory measurements of vortex-induced vibrations of a tension riser

Chaplin, J.R.; Bearman, P. W.; Cheng, Yu; Fontaine, E.; Graham, John M.; Herfjord, Kjell; Huarte, F.J. Huera; Isherwood, Mike; Lambrakos, Kostas F.; Larsen, Carl M.; Meneghini, Júlio Romano; Moe, Geir; Pattenden, R.J.; Triantafyllou, Michael S.; Willden, R.H.J.

doi:10.1016/j.jfluidstructs.2005.05.016

Cited by 168 publications

(91 citation statements)

References 12 publications

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“…The CF dominant modes were up to the fourth while the IL the sixth. As discussed by a few researchers (Chaplin et al, 2005;Lie and Kaasen, 2006), the overall response of a long flexible cylinder generally combines not only one excited mode over a certain range of the reduced velocity. Thus, the dominant modes investigated here are not always the highest one as the reduced velocity increases.The maximum CF and IL dominant modes for the square-sectioned straked cylinder were both Mode 2, which were lower than that for the bare cylinder.…”

Section: Dominant Response Frequencies and Dominant Modesmentioning

confidence: 99%

Influences of the helical strake cross-section shape on vortex-induced vibrations suppression for a long flexible cylinder

Luan

Liu

et al. 2017

China Ocean Eng

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An experimental study on a bare flexible cylinder as well as cylinders fitted with two types of cross-sectioned helical strakes was carried out in a towing tank. The main purpose of this paper is to investigate the effects of strakes' crosssection on the vortex-induced vibrations (VIV) suppression of a flexible cylinder. The square-sectioned and roundsectioned helical strakes were selected in the experimental tests. The uniform current was generated by towing the cylinder models along the tank using a towing carriage. The Reynolds number was in the range of 800-16000. The strain responses were measured by the strain gages in cross-flow (CF) and in-line (IL) directions. A modal analysis method was adopted to obtain the displacement responses using the strain signals in different measurement positions. The comparison of the experimental results among the bare cylinder, square-sectioned straked cylinder and roundsectioned straked cylinder was performed. The helical strakes can effectively reduce the strain amplitude, displacement amplitude, response frequencies and dominant modes of a flexible cylinder excited by VIV. And the mean drag coefficients of straked cylinders were approximately consistent with each other. In addition, the squaresectioned and round-sectioned strakes nearly share the similar VIV reduction behaviors. Sometimes, the strakes with round-section represent more excellent effects on the VIV suppression of response frequency than those with squaresection.

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Section: Dominant Response Frequencies and Dominant Modesmentioning

confidence: 99%

Influences of the helical strake cross-section shape on vortex-induced vibrations suppression for a long flexible cylinder

Luan

Liu

et al. 2017

China Ocean Eng

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“…However, they have some common shortcomings. The response is assumed to take place at a limited number of discrete frequencies and the programs are only able to calculate CF vibrations [5] . Baarholm et al [6] indicated, however, that fatigue damage from IL vibrations may become significant for long cylinder structure.…”

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confidence: 99%

Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators

Wang

et al. 2009

Sci. China Ser. G-Phys. Mech. Astron.

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The dynamics of long slender cylinders undergoing vortex-induced vibrations (VIV) is studied in this work. Long slender cylinders such as risers or tension legs are widely used in the field of ocean engineering. When the sea current flows past a cylinder, it will be excited due to vortex shedding. A three-dimensional time domain model is formulated to describe the response of the cylinder, in which the in-line (IL) and cross-flow (CF) deflections are coupled. The wake dynamics, including in-line and cross-flow vibrations, is represented using a pair of non-linear oscillators distributed along the cylinder. The wake oscillators are coupled to the dynamics of the long cylinder with the acceleration coupling term. A non-linear fluid force model is accounted for to reflect the relative motion of cylinder to current. The model is validated against the published data from a tank experiment with the free span riser. The comparisons show that some aspects due to VIV of long flexible cylinders can be reproduced by the proposed model, such as vibrating frequency, dominant mode number, occurrence and transition of the standing or traveling waves. In the case study, the simulations show that the IL curvature is not smaller than CF curvature, which indicates that both IL and CF vibrations are important for the structural fatigue damage.

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“…A blockage ratio (D/B) of 10% is selected in this paper based on the simulation results presented by Anagnostopoulos and Minear10), who performed a parametric study using blockage ratios ranging from 10% to 50% and found that the blockage effect is almost negligible for blockage ratios lower than 20%. •\ 1103•\ Although, the experimental model presented in this paper is excited at Reynolds numbers up to 600, Chaplin et al 15) proved in their comparative study that the prediction of the maximum response of a flexible riser under synchronization events is complex due to the unpredictable nature of the riser response.…”

Section: Hydrodynamic In-line Force Coefficientsmentioning

confidence: 89%

CFD Modeling of Fluid-Structure Interaction for Oscillating Flexible Risers

Riveros

Utsunomiya

Maeda

et al. 2007

Journal of applied mechanics

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The dynamic response of an oscillating flexible riser involves a coupled phenomenon in which the nature and magnitude of the fluid forces acting on the riser highly depend on the structural riser's response. Therefore, the development of a response prediction model for oscillating flexible risers must consider the numerical modeling of fluid-structure interaction. In this paper a response prediction model for oscillating flexible risers using CFD-derived force coefficients is presented. A 20-meter riser model, sinusoidally excited at its top end using six different values of tension forces, is employed for its experimental validation. The computed maximum amplitudes in both in-line and cross-flow directions show good agreement with the experimental data considering the range of error commonly accepted for such implementations.

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Blind predictions of laboratory measurements of vortex-induced vibrations of a tension riser

Cited by 168 publications

References 12 publications

Influences of the helical strake cross-section shape on vortex-induced vibrations suppression for a long flexible cylinder

Influences of the helical strake cross-section shape on vortex-induced vibrations suppression for a long flexible cylinder

Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators

CFD Modeling of Fluid-Structure Interaction for Oscillating Flexible Risers

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