VIV response of a long flexible riser fitted with strakes in uniform and linearly sheared currents

Gao, Yun; Fu, Shixiao; Ren, Tao; Xiong, Yan; Song, Li

doi:10.1016/j.apor.2015.05.006

Cited by 80 publications

(11 citation statements)

References 35 publications

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“…It was experimentally proved that the strake with triple-start and 0.25D/17.5D height/pitch is the most effective configuration for the VIV reduction of the flexible cylinders in water. The similar findings were also presented by Trim et al (2005) and Gao et al (2015b).…”

Section: Discussionsupporting

confidence: 78%

“…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: 80%

“…Hence, the most effective configuration of strake with triple-start and 0.25D/17.5D height/pitch for VIV suppression of flexible cylinders in water (Trim et al, 2005;Gao et al, 2015b) was selected in this research work. As shown in Fig.…”

Section: Description Of Experimentsmentioning

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%

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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: Discussionsupporting

confidence: 78%

Section: Dominant Response Frequencies and Dominant Modessupporting

confidence: 80%

Section: Description Of Experimentsmentioning

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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“…Among these problems, VIV, which can be explained as the vibration stimulated by the external fluid flow vortices when interacting with the structure, is one of the critical design issue of the riser. Currently most of the investigations of the VIV of riser are conducted experimentally [1][2][3][4]. Nevertheless, due to the high cost in constructing the experimental facilities and large aspect ratio of the riser, several factors are usually being constrained in the model testing.…”

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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Experimental Study on a Side-By-Side Configuration of Two Cylinders Helically Covered by Triple Rods

Prastianto

Pumbarino

2022

Lecture Notes in Mechanical Engineering

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VIV response of a long flexible riser fitted with strakes in uniform and linearly sheared currents

Cited by 80 publications

References 35 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

Experimental Study on a Side-By-Side Configuration of Two Cylinders Helically Covered by Triple Rods

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