VIV Response of Long Free Spanning Pipelines

Nielsen, Finn Gunnar; Søreide, Tore H.; Kvarme, Stig Olav

doi:10.1115/omae2002-28075

Cited by 12 publications

(12 citation statements)

References 1 publication

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“…All of these studies were concerned with the first mode VIV motion of the pipe. Recently, Sreide et al [13] and Nielsen et al [14] investigated the cable effect on VIV and multi-mode vibration of long free spanning pipelines. Lee et al [15] investigated the pipe stiffness on its first mode in-line VIV motion.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of vortex-induced vibrations of long free spans near seabed

Wang

et al. 2011

Sci. China Technol. Sci.

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There are many experimental studies dedicated to determining the effect of the proximity of a plane boundary on the vortex-induced vibration (VIV) of submarine pipeline spans, but they all only concerned the first mode VIV motion of the pipe. In this paper, a pipe model, 16 mm in diameter, 2.6 m in length and with a mass ratio (mass/displaced mass) of 4.30, was tested in a current tank. The reduced velocity was in the range of 0-16.7 and gap ratios at the pipe ends were 4.0, 6.0 and 8.0. The response of the model was measured using optical fiber strain gauges. Results of response amplitude and frequency were presented and the transition from the first dominant mode to the second one was shown. In the tests, it was found that the response amplitude experienced a continuous transition between the two modes, but the dramatic increase in the response frequency appeared with the shift in dominant mode from the first mode to the second one as the flow velocity increased. As the gap ratio decreased, the shift in the dominant mode took place at a higher reduced velocity. vortex-induced vibration, free spanCitation: Li X C, Wang Y X, Li G W, et al. Experimental investigation of vortex-induced vibrations of long free spans near seabed. Sci China Tech Sci, 2011, 54: 698704,

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of vortex-induced vibrations of long free spans near seabed

Wang

et al. 2011

Sci. China Technol. Sci.

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“…Subsea cables, free-spanning pipelines and a variety of slender structural components are often subjected to current and wave conditions that may lead to damage due to vortex-induced vibrations (VIV). Nielsen, Soreide and Kvarme [1] reported on a free-spanning pipeline designed for the Ormen Lange fi eld, located off the western coast of Norway, which had a length to diameter ratio (L/D) of 846, which is much larger than the typical limit value of 120, proposed by Det Norske Veritas [2]. The complexity of offshore installations involving combined environmental loads on large-scale structures supports the need of experimental study to investigate the system response behavior and the potential requirement for VIV suppression in certain design conditions.…”

Section: Introductionmentioning

confidence: 98%

Comparison of airfoil and ribbon fairings for suppression of flow-induced vibrations

Fang¹,

Niedzwecki²

2014

Int. J. CMEM

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Cables and various subsea product fl ow-lines are often subjected to fl ow-induced vibrations as a consequence of wave or wave and current fl ow excitation. An experimental study that explores the comparative suppression effectiveness of airfoil and ribbon fairings is presented. In the experimental investigation, an instrumented tensioned 29 m horizontal composite cylinder with a length to diameter ratio of 760 is subjected to a range of uniform current and combined current and regular wave conditions. In the analysis of the cross-fl ow response amplitude ratios, modal parameters, such as mode shape, damping ratio were extracted. The analytical procedures were performed using a modifi ed time domain decomposition technique. The analysis illustrated the amplifi ed response behavior for bare cylinders, and illustrated that full coverage by airfoil and ribbon fairings could effectively suppress fl ow-induced vibrations in current only conditions, but both fairings were ineffective when regular wave conditions were superimposed on the uniform current conditions, even though the airfoil provided larger damping than ribbon fairings. Under combined wave and current conditions, the response behavior of either suppression device was found to be insensitive to coverage densities.

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“…Extensive model tests of Ormen Lange gas pipeline were carried out in the Ocean Basin of MARINTEK (now SIN-TEF Ocean) during the period between 2000 to 2003 [2]. Full-scale prototype section of the Ormen Lange umbilical was tested in a later phase [3].…”

Section: Introductionmentioning

confidence: 99%

In-Line VIV Based on Forced-Vibration Tests

Yin

Passano

et al. 2019

Volume 2: CFD and FSI

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Excitation and added mass functions determined from forced vibration tests of a rigid cylinder undergoing harmonic motion in the flow are used in the semi-empirical software VIVANA to predict the VIV response of pipelines. An advantage of this approach, as opposed to the more-commonly-used response function approach, is that it can account for changing conditions along the length of the pipe, like changing current velocity, seabed proximity, and/or pipe diameter. This makes it useful for pipelines as well as for risers when such changes occur. Further, for pipelines, travelling wave effects play less of a role than for risers, so the VIVANA approach can be simplified by assuming the phase angle of the harmonic response is constant along the span. The interactions between cross-flow and in-line response that complicate the prediction of cross-flow VIV by the excitation function approach, do not arise for pure inline VIV. For the latter case, using the pure in-line forced vibration test data of Aronsen (2007), it is found that both VIVANA approach and simplified ‘SIVANA’ approach thereof predict VIV amplitudes consistent with experiments on flexible pipe (Ormen Lange umbilical VIV tests), and the DNVGL-RP-F105 response function for a range of structural and soil damping values. In a companion paper, this approach is applied partially strake-covered pipeline spans, to show that a relatively small fraction of well-placed strake coverage is enough to suppress in-line VIV.

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VIV Response of Long Free Spanning Pipelines

Cited by 12 publications

References 1 publication

Experimental investigation of vortex-induced vibrations of long free spans near seabed

Experimental investigation of vortex-induced vibrations of long free spans near seabed

Comparison of airfoil and ribbon fairings for suppression of flow-induced vibrations

In-Line VIV Based on Forced-Vibration Tests

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