Added Mass and Oscillation Frequency for a Circular Cylinder Subjected to Vortex-Induced Vibrations and External Disturbance

Vikestad, Kyrre; Vandiver, J. Kim; Larsen, Carl M.

doi:10.1006/jfls.2000.0308

Cited by 143 publications

(67 citation statements)

References 3 publications

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“…The added mass is obtained by a frequency domain analysis procedure as in Fujarra and Pesce (2002), as follows: (15) where is the total hydrodynamic force, including potential added mass and fluid damping. Therefore, the following arrives: Mainly in high reduced velocities, larger than 8.0, the model fairly well reproduces the behavior of the added mass as obtained by Fujarra and Pesce (2002) and by Vikestad et al (2000). For reduced velocities smaller than that, it is difficult to obtain the added mass from the experimental data, as the amplitudes and forces are very small.…”

Section: Variation Of Aspect Ratiosupporting

confidence: 56%

“…There is a large variation in the added mass caused by variation in Strouhal number. It is important to notice that, once the Strouhal approaches 0.2, the added mass approaches the value -1, a common result for infinite cylinders, see Vikestad et al (2000). On the other hand, the added mass approaches 0 when the Strouhal number is below 0.1.…”

Section: Variation Of Strouhal Numbermentioning

confidence: 87%

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Parametric analysis of a phenomenological model for vortex-induced motions of monocolumn platforms

Rosetti¹,

Gonçalves²,

Fujarra³

et al. 2011

J. Braz. Soc. Mech. Sci. & Eng.

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Section: Variation Of Aspect Ratiosupporting

confidence: 56%

Section: Variation Of Strouhal Numbermentioning

confidence: 87%

Parametric analysis of a phenomenological model for vortex-induced motions of monocolumn platforms

Rosetti¹,

Gonçalves²,

Fujarra³

et al. 2011

J. Braz. Soc. Mech. Sci. & Eng.

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“…A (linear) finite element model is made, providing the natural frequencies of the structure. For simplicity, still water added mass is assumed, even though the response itself might change the added mass properties quite significantly (see for instance Vikestad et al (2000)). The same hydrodynamic coefficients as presented in table 2 are utilized (i.e.…”

Section: Discussion Of Stochastic Propertiesmentioning

confidence: 99%

Stochastic modelling of cross-flow vortex-induced vibrations

et al. 2017

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Semi-empirical models are commonly used to predict vortex-induced vibrations (VIV). Empirical parameters are often based on forced harmonic motion tests of short rigid cylinders in one degree of freedom, which is a significant simplification of the three dimensional VIV experienced by flexible cylinders. Still, the models may provide satisfactory estimates of the response of slender marine structures exposed to current. At least in terms of root mean square (r.m.s.) of displacements and strains, dominating frequency and dominating mode. However, VIV of long slender beams, especially in sheared current, show large response variability in time and space, which appears to be of a random nature. Semi-empirical models that predict steady-state VIV are hence unable to reflect the non-stationary response observed in experiments, even though the time and space averaged result might be well represented.In this work, a previously published semi-empirical time domain model for cross-flow vortex-induced vibrations is modified to describe the stochastic nature of the response of long slender beams subjected to stationary current. The mean non-dimensional frequency of the synchronization model (previously constant) is taken to be a simplified Gaussian process, where standard deviation and spectral frequencies are input. The stochastic synchronization model allows the response to jump between different eigenfrequencies and corresponding modes, and still predict mean and r.m.s. values close to the deterministic model. Its performance is verified through simulation of an experiment with a long riser in sheared flow. The response sensitivity of standard deviation and spectral frequencies is investigated. It indicates that for a proper choice of empirical coefficients, the chaotic response of the riser can be quite realistically simulated in terms of frequency variation and, to some extent, amplitude modulation.

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“…(17) and (18) as the input data, the overall distribution of hydrodynamic forces along the axis of the riser model can be obtained by eq. (16).…”

Section: Evaluation Of Hydrodynamic Coefficientsmentioning

confidence: 99%

Identification of hydrodynamic coefficients from experiment of vortex-induced vibration of slender riser model

Tang

Lü

Teng

et al. 2011

Sci. China Technol. Sci.

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One of the challenges in predicting the dynamic response of deepwater risers under vortex-induced vibration (VIV) is that it runs short of believable fluid loading model. Moreover, the hydrodynamic loading is also difficult to be measured directly in the VIV experiments without disturbing the fluid field. In the present work, by means of a finite element analysis method based on the experimental data of the response displacements, the total instantaneous distributions of hydrodynamic forces together with the hydrodynamic coefficients on the riser model with large aspect ratio (length/diameter) of 1750 are achieved. The steady current speeds considered in the experiments of this work are ranging from 0.15 m/s to 0.60 m/s, giving the Reynolds Number between 2400 and 9600. The hydrodynamic coefficients are evaluated at the fundamental frequency and in the higher order frequency components for both in-line and cross-flow directions. It is found that the Root-Mean Squared hydrodynamic forces of the higher order response frequency are larger than those of the fundamental response frequency. Negative lift or drag coefficients are found in the numerical results which is equivalent to the effect of fluid damping. vortex-induced vibration, deepwater riser, hydrodynamic coefficients, finite element method, dynamic response Citation:Tang G Q, Lu L, Teng B, et al. Identification of hydrodynamic coefficients from experiment of vortex-induced vibration of slender riser model. Sci

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Added Mass and Oscillation Frequency for a Circular Cylinder Subjected to Vortex-Induced Vibrations and External Disturbance

Cited by 143 publications

References 3 publications

Parametric analysis of a phenomenological model for vortex-induced motions of monocolumn platforms

Parametric analysis of a phenomenological model for vortex-induced motions of monocolumn platforms

Stochastic modelling of cross-flow vortex-induced vibrations

Identification of hydrodynamic coefficients from experiment of vortex-induced vibration of slender riser model

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