Phenomena Observed in VIV Bare Riser Field Tests

Marcollo, Hayden; Chaurasia, Hemant Kumar; Vandiver, J. Kim

doi:10.1115/omae2007-29562

Cited by 16 publications

(22 citation statements)

References 7 publications

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“…A significant effort has been made over the last fifteen years by several prestigious universities worldwide to develop new VIV models or improve existing ones and to benchmark VIV software against experiments, see for example the blind predictions of laboratory measurements of VIV of a tensioned riser ( [1], [2]). Recent field experiments [3] as well as analyses of full scale data ( [4], [5]) have confirmed the complex nature of VIV that was previously observed in laboratory experiments [6] and emphasized the importance of in-line vibrations and super-upper harmonics, in addition to the well-known crossflow vibrations.…”

Section: Introductionmentioning

confidence: 62%

Reliability Based Factors of Safety for VIV Fatigue Using NDP Riser High Mode VIV Tests

Fontaine¹,

Marcollo²,

Vandiver³

et al. 2011

Volume 7: CFD and VIV; Offshore Geotechnics

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Understanding the level of conservatism in a riser system design for vortex-induced vibration (VIV) fatigue is an important issue for operators. This study represents a demonstration of the calibration methodology to derive consistent values for the Factor of Safety (FoS). The exercise is performed here based on medium scale VIV data and utilizing the most commonly used VIV prediction software by industry. The results emphasize the need for (i) a coherent approach to estimate the FoS to be used and (ii) monitoring/measurement of software improvements as this may increase risk of failure if the influence of such improvements on the FoS is not quantified.

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Section: Introductionmentioning

confidence: 62%

Reliability Based Factors of Safety for VIV Fatigue Using NDP Riser High Mode VIV Tests

Fontaine¹,

Marcollo²,

Vandiver³

et al. 2011

Volume 7: CFD and VIV; Offshore Geotechnics

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“…(Re=10000-75000,L/D=4200). The Miami2 experiments are described in ( [13], [14] , [15], [16] [5]. (Re=4000-50000,L/D=500).…”

Section: Methodology For Developing Viv Fatigue Fosmentioning

confidence: 99%

“…The SHEAR7 JIP (MIT) and the DeepStar JIP conducted the 2006 Gulf Stream tests ('Miami2') [12], which are described in [13], [14], [15], [16]. The experimental setup is presented in Figure 1.…”

Section: Miami2 500ft Deepstar Small Reynolds Number Field Test Datamentioning

confidence: 99%

“…Field experiments ( [3], [4], [5]) and analysis of full-scale data ( [6], [7], [8]) have confirmed the existence of complicating factors in VIV such as in-line vibrations, higher harmonics, intermittent behavior, travelling waves and chaotic sensitivity to small perturbations. These phenomena are only in the earliest stages of being included, if at all, in VIV fatigue analysis software.…”

Section: Introductionmentioning

confidence: 99%

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Using Model Test Data to Assess VIV Factor of Safety for SCR and TTR in GOM

Fontaine¹,

Rosen²,

Marcollo³

et al. 2013

Volume 7: CFD and VIV

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“…Analysis of the data from the Gulf Stream experiments reveals that the cross-flow response is characterized by the presence of traveling waves [1,3]. Another interesting feature of the measured response is that the maximum strain is not at the same spatial location as the maximum incident current.…”

Section: Characteristics Of High Mode Number Viv Response Datamentioning

confidence: 99%

Modeling Traveling Waves Using Mode Superposition

Jaiswal¹,

Sheshadri

Vandiver

2010

29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 1

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Analysis of the data from two Vortex-Induced Vibration (VIV) experiments conducted in the Gulf Stream on a 500-foot-long, 1.43 inches diameter, flexible, tension dominated riser model revealed that the response is predominantly characterized by the presence of traveling waves. It was also observed that the location of the VIV excitation region (power-in) affects the characteristics of the response. The conventional method of modeling the excitation force as a standing wave was found inadequate to predict the location of the peak measured response accurately, especially in the cases where the excitation region is close to a boundary (the ends of the riser model).A modified excitation force model consisting of a combination of standing and traveling wave excitation regions is demonstrated to predict the location of the peak response more accurately. This work presents the idea of modifying the VIV excitation model to include traveling wave characteristics and using mode superposition method for computing the response to this modified force. Examples of the implementation of this method are shown for the two distinct cases of the location of the power-in region -the power-in region adjacent to the boundary and the power-in region away from the boundary. Depending on the location of the power-in region, different proportions of standing and traveling wave excitations are used to yield predicted responses that match the measured response characteristics.

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Phenomena Observed in VIV Bare Riser Field Tests

Cited by 16 publications

References 7 publications

Reliability Based Factors of Safety for VIV Fatigue Using NDP Riser High Mode VIV Tests

Reliability Based Factors of Safety for VIV Fatigue Using NDP Riser High Mode VIV Tests

Using Model Test Data to Assess VIV Factor of Safety for SCR and TTR in GOM

Modeling Traveling Waves Using Mode Superposition

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