Damping Parameters for flow-induced vibration

This paper explores the Reynolds number dependence of the Vortex-Induced Vibration (VIV) of flexible marine risers. Emphasis is placed on revealing the trends that exist between the Strouhal number and the Reynolds number and between the dimensionless amplitude (A/D) and Reynolds number. Data is drawn from recent towing tank experiments which used flexible cylinders of three different diameters. The 38m long pipes were exposed to uniform and sheared currents. The Reynolds number range extended from approximately 5,000 to 220,000 -well into the critical regime-with the larger diameter pipes responding in up to the 13 th mode and the smaller diameter pipe responding well above the 20 th mode. The results and trends from this set of experiments are compared to previous results from laboratory and field experiments. INTRODUCTIONThe Reynolds number, Re, is a very important dimensionless parameter in most fluid dynamics problems including VIV.

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“…The authors clearly demonstrate that the response amplitude depends on the Reynolds number and some form of damping parameter. Vandiver (2012) …”

Section: ܴ݁ = ܷ ‫ܦ‬ ‫ݒ‬mentioning

confidence: 99%

Reynolds Number Effects on the Vortex-Induced Vibration of Flexible Marine Risers

Resvanis

Jhingran

Vandiver

et al. 2012

Volume 5: Ocean Engineering; CFD and VIV

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“…It equals 200 x 109 N/m 2 , the volumetric mass intensity, or it could be the density of a substance for its mass divided by volume. It equals 7.8 g/cm 3 , whereas it equals 7850 Kg/m 3 for the same material. The ρ is the most common formula used to describe density, density is written as mass per unit volume.…”

Section: The Geometrical Properties and Materials Propertiesmentioning

confidence: 92%

“…One of studies has been finished regarding damping parameters of one degree of freedom. The damping parameters, which is represented as * = 2 2 , are very important in practical aspect for VIV response prediction of elastic structure, investigated by J. Kim Vandiver (2012) [3].…”

Section: Introductionmentioning

confidence: 99%

Exposure the System of Polystyrene and the Steel to Various Flow Velocities and Finding its Equation of Motion

Alhachami¹

2016

JFFHMT

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“…Popular VIV response prediction programs, such as SHEAR7, VIVA, and VIVANA, can perform such calculations and typically predict substantial amounts of hydrodynamic damping on the riser. The dimensionless damping parameter, c Ã , introduced by Vandiver [14] and extended to flexible cylinders by Rao and Vandiver in Ref. [15] captures the effects of damping even in cases with partial strake coverage and is much better suited at predicting response amplitudes of risers in realistic conditions.…”

Section: Strake Efficiencymentioning

confidence: 99%

Effects of Strake Coverage and Marine Growth on Flexible Cylinder Vortex-Induced Vibrations1

Resvanis

Rao

Vandiver

2016

Journal of Offshore Mechanics and Arctic Engineering

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This paper presents some results from the recent SHELL tests at the MARINTEK basin. The tests involved towing densely instrumented flexible cylinders at Reynolds numbers up to 220,000. The main objective is to present the experimental results describing the effectiveness of different amounts of strake coverage and to explore the influence of simulated marine growth. The data are presented in terms of cross-flow (CF) response amplitudes and rainflow-counted damage rates due to the combined CF and in-line (IL) bending stresses. All the results are compared with the bare cylinder cases which will be used as a reference to determine how effective the strakes are in suppressing vortex-induced vibrations (VIV) and how this effectiveness can be affected by marine growth. The results show that even small bare sections (missing strakes) can lead to significant VIV response. Finally, the tests revealed that even moderate amounts of marine growth can quickly negate any suppression coming from the strakes.

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Damping Parameters for flow-induced vibration

Cited by 63 publications

References 25 publications

Reynolds Number Effects on the Vortex-Induced Vibration of Flexible Marine Risers

Reynolds Number Effects on the Vortex-Induced Vibration of Flexible Marine Risers

Exposure the System of Polystyrene and the Steel to Various Flow Velocities and Finding its Equation of Motion

Effects of Strake Coverage and Marine Growth on Flexible Cylinder Vortex-Induced Vibrations1

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