Investigation on the effectiveness of helical strakes in suppressing VIV of flexible riser

Quen, Lee Kee; Abu, Aminudin; Kato, Nobuo; Muhamad, Pauziah; Sahekhaini, Asnizah; Abdullah, Hayati

doi:10.1016/j.apor.2013.11.006

Cited by 87 publications

(17 citation statements)

References 19 publications

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“…However, the dominant frequency of the flexible cylinder fitted with helical strakes did not increase linearly with the reduced velocity anymore. This trend is similar to the experimental results of the VIV suppression by several previous researchers (Trim et al, 2005;Quen et al, 2014a;Gao et al, 2015b). In addition, the frequency reduction with the round-sectioned strakes was more effective than that of the square-sectioned strakes, especially in the CF direction.…”

Section: Dominant Response Frequencies and Dominant Modessupporting

confidence: 91%

“…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%

“…It was observed that both strake geometries were effective in suppressing the VIV in uniform and shear flow. Quen et al (2014a) investigated the effectiveness of the strakes for the reduction of VIV of a long flexible cylinder by varying the pitch and height of the strakes. Three configurations of heights (0.05D, 0.10D and 0.15D) and three configurations of pitches (5.0D, 10.0D and 15.0D) were selected in the experimental study.…”

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: Dominant Response Frequencies and Dominant Modessupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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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“…The simulation is run for cylinder fitted with and without helical strakes. The existing experimental results of bare cylinder with similar configuration [13] are used as for comparison. (4) where D is the diameter of cylinder, fn is the natural frequency and U as the flow velocity.…”

Section: Resultsmentioning

confidence: 99%

“…Since the reviews have shown that FSI study on riser is very limited and preliminary, we hope to explore its capability in predicting the VIV characteristic of cylinder fitted with and without helical strakes in three-dimension. The existing experimental results of bare cylinder -cylinder without fitted with helical strakes [13] will be used as benchmark to validate the simulation outputs.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Vortex-Induced Vibration of Bare Cylinder and Cylinder Fitted with Helical Strakes

Lee¹,

Abu²,

Muhamad³

et al. 2017

MATEC Web Conf.

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Abstract. In the study, the vortex-induced vibration (VIV) of a cylinder fitted with and without helical strakes is investigated using fluid-structure interaction (FSI) software. The purpose is to predict the VIV characteristic of cylinder fitted with and without helical strakes. Fluid and structural solvers in commercial computational fluid dynamic (CFD) software were implemented as two-way FSI solvers to develop the simulation. A flexible circular cylinder of diameter, D = 0.018 m was tested. The pitch and height of the helical strakes were 10D and 0.10D, respectively. Existing experiment outputs of bare cylinder were used as benchmark to verify the simulated results. In overall, the simulation was able to predict the trend of the amplitude response and the mean drag coefficient. However, a slight over-prediction was noticed. It was also found that the helical strakes was able to reduce up to 60% of the VIV in water.

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Prediction on the Performance of Helical Strakes Through Fluid-Structure Interaction Simulation

Lee

Abu

Muhamad

et al. 2017

Communications in Computer and Information Science

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Investigation on the effectiveness of helical strakes in suppressing VIV of flexible riser

Cited by 87 publications

References 19 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

Prediction of Vortex-Induced Vibration of Bare Cylinder and Cylinder Fitted with Helical Strakes

Prediction on the Performance of Helical Strakes Through Fluid-Structure Interaction Simulation

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