An experimental investigation by towing tank on VIV of a long flexible cylinder for deepwater riser application

Gu, Jijun; Vitola, Marcelo A.; Coelho, Jairo; Pinto, Waldir Terra; Duan, Menglan; Levi, Carlos

doi:10.1007/s00773-013-0213-6

Cited by 28 publications

(9 citation statements)

References 28 publications

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“…This phenomenon was also observed in the experiment of the VIV reduction for a flexible cylinder (Quen et al, 2014a). The mean drag coefficients of the straked cylinders present a scattered feature as those of Huera-Huarte and Bearman (2009) and Gu et al (2013) on the bare flexible cylinder. In addition, the mean drag coefficients of the flexible cylinder fitted with the round-sectioned strakes were similar with those of square-sectioned straked cylinder, except for that the reduced velocity was in the range of 5.0-10.0.…”

Section: Mean Drag Forcessupporting

confidence: 65%

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: Mean Drag Forcessupporting

confidence: 65%

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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“…As riser pipes often possess a length-to-diameter ratio (L/D) of the order of 10 3 (Chaplin et al, 2005), many experiments have been carried out on deepwater risers with large L/D (Tognarelli et al, 2004;Chaplin et al, 2005;Trim et al, 2005;Lie and Kaasen, 2006;Vandiver et al, 2006;Tognarelli et al, 2008;Vandiver et al, 2009;Huang et al, 2011b;Gu et al, 2013;Gao et al, 2015). These experiments investigated flexible riser VIV responses under different flow conditions and some also assessed the effectiveness of VIV suppression techniques, such as using helical strakes.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of vortex-induced vibration of a vertical riser in uniform and linearly sheared currents

Wang

Xiao

2016

Ocean Engineering

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This paper presents a numerical study on vortex-induced vibration (VIV) of a vertical riser subject to uniform and linearly sheared currents. The model vertical riser tested at the MARINTEK by ExxonMobil is considered. The predicted numerical results are in good agreement with the experimental data. It is found that the dominant mode numbers, the maximum root mean square amplitudes, the dominant frequencies and the fatigue damage indices increase with the flow velocity. A standing wave response is observed for the single-mode in-line (IL) and cross-flow (CF) vibrations. Dual resonance is found to occur at most of the locations along the riser. At some locations along the riser, a third harmonic frequency component is observed in the CF response and a frequency component at the CF response frequency is found in the IL response apart from the frequency component at twice the CF response frequency. The majority of the vortex shedding shows a clear 2S pattern, whereas a 2P mode is observed near the position where the maximum vibration amplitude appears. The higher IL fatigue damage in the present study emphasises the importance of the IL fatigue damage especially in the design of low flow velocity or low mode number applications

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“…This is different from the findings of the study by Sanaati & Kato [1], where there were two peaks clearly shown for CF response amplitude. Clear initial upper branch and lower branch were also found in the study by Gu et al [11] and Huera-Huarte and Bearman [8] at low pre-tension. However, Huera-Huarte and Bearman [8] only observed initial and upper branches at high pre-tension.…”

Section: Resultsmentioning

confidence: 56%

Mitigating flow-induced vibration of a flexible circular cylinder via pre-tension

Cen

Ahmadi-Baloutaki

Ting

et al. 2015

Sustainable Energy Technologies and Assessments

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An experimental investigation by towing tank on VIV of a long flexible cylinder for deepwater riser application

Cited by 28 publications

References 28 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

Numerical simulation of vortex-induced vibration of a vertical riser in uniform and linearly sheared currents

Mitigating flow-induced vibration of a flexible circular cylinder via pre-tension

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