Experimental investigation of the effects of the coverage of helical strakes on the vortex-induced vibration response of a flexible riser

Gao, Yun; Yang, Juntao; Xiong, Yan; Wang, Menghao; Geng, Peng

doi:10.1016/j.apor.2016.03.016

Cited by 53 publications

(23 citation statements)

References 22 publications

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“…A modal analysis method was used to obtain the cylinder responses according to the measured bending strain data of the cylinder models (Trim et al, 2005;Lie and Kaasen, 2006;Song et al, 2011;Gao et al, 2016). Firstly, the dynamic response of a bare flexible cylinder excited by the vortex shedding was presented and discussed.…”

Section: Resultsmentioning

confidence: 99%

“…For cylinders in wind, an effective helical strake geometry has three starts (each spaced 120° apart around the cylinder circumference) (Zhou et al, 2011;Sui et al, 2016). Moreover, it has been proved that the triple-start helical strake system has worked well for many years in water and used popular for VIV suppression of marine slender structures (Trim et al, 2005;Quen et al, 2014a;Gao et al, 2016). In addition, it has also been observed that with the increasing strakes coverage, the VIV suppression efficiency of a flexible cylinder increased gradually to the maximum at 100% coverage (Frank et al, 2004;Trim et al, 2005;Vandiver et al, 2006;Gao et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…A few researchers have also studied the effects of the number of start screw heads (Quen et al, 2014b) and strakes coverage density on VIV reduction (Allen et al, 2004;Frank et al, 2004;Trim et al, 2005;Vandiver et al, 2006;Jaiswal and Vandiver, 2007;Gao et al, 2016). Helical strakes generally consist of one or more starts that spiral along the structure's length.…”

Section: Introductionmentioning

confidence: 99%

“…VIV may cause serious fatigue damageon the structures in offshore engineering. Much research work has been done on this typical fluid-structure interaction phenomenon throughout centuries, both numerically and experimentally, toward the understanding of the dynamic response features of VIV (Naudascher, 1987;Sarpkaya, 2004;Gabbai and Benaroya, 2005;Williamson and Govardhan, 2008;Wu et al, 2012b;Fan et al, 2015) and the VIV suppression (Zdravkovich, 1981;Bearman and Owen, 1998;Galvao et al, 2008;Assi et al, 2009;Wu et al, 2012a;Huera-Huarte, 2014;Gao et al, 2015aGao et al, , 2015bGao et al, , 2016.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the influence of the strakes' height is more significant than that of the strakes' pitch in suppressing VIV of a flexible cylinder. Gao et al (2016) performed some laboratory tests on VIV of a bare cylinder model and straked models with different strakes in a towing tank. The pitches of strakes were 5.0D, 17.5D and 20.0D, and the heights were 0.10D, 0.15D and 0.25D, respectively.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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A study on vibration-suppression mechanism for risers using flexible structural joints

Fujiwara

2024

J Mar Sci Technol

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These new mechanisms for suppressing vibration in large diameter intake pipes and pumping systems has been developed for use in Floating Liquefied Natural Gas (FLNG) facilities. Like existing devices such as fairings and strakes, this mechanism is designed for practical use and has a flow path inside the pipe. The mechanism is designed to suppress vibration caused by both float motion and vortex-induced vibration (VIV) due to currents. Experiments were conducted using a scale model, and numerical calculations were used to evaluate the mechanism’s ability to reduce vibration. As a result, the natural frequencies of the pipes were analyzed, and it was found that the vibration damping mechanism, when installed at appropriate locations, can provide effective vibration suppression against the motion of the upper float and vibration caused by VIV due to currents over the entire length of the pipe, even at limited installation locations. On the other hand, it was found that the vibration suppression effect could not be achieved without appropriate positioning, and that the longer the pipe length, the more limited the vibration damping capability.

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Review of passive control of flow past a circular cylinder

Ran

Deng

et al. 2022

J Vis

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Experimental investigation of the effects of the coverage of helical strakes on the vortex-induced vibration response of a flexible riser

Cited by 53 publications

References 22 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

A study on vibration-suppression mechanism for risers using flexible structural joints

Review of passive control of flow past a circular cylinder

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