Vortex-Induced Vibrations of Risers: Theoretical, Numerical and Experimental Investigation

Cunff, Cédric Le; Biolley, F.; Fontaine, E.; Étienne, Stéphane

doi:10.2516/ogst:2002004

Cited by 28 publications

(6 citation statements)

References 20 publications

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“…In case of laminar free-stream, it is reasonable to assume that the self-excited forces are fully correlated over one element, as noted by Scanlan [38]. This assumption was further examined in a numerical study [39], where it was observed that the 3D coherence effects in the wake have minor effect on the flutter derivatives for streamlined decks. However, the energy transfer between modes can severely affect the flutter limit [40], and thus, it is necessary to consider the 3D dynamic behavior of the structure.…”

Section: Laminar Pseudo-3d Vortex Particle Methodsmentioning

confidence: 99%

Aeroelastic analyses of bridges using a Pseudo-3D vortex method and velocity-based synthetic turbulence generation

Kavrakov

Morgenthal

2018

Engineering Structures

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The accurate representation of aerodynamic forces is essential for a safe, yet reasonable design of long-span bridges subjected to wind effects. In this paper, a novel extension of the Pseudo-three-dimensional Vortex Particle Method (Pseudo-3D VPM) is presented for Computational Fluid Dynamics (CFD) buffeting analysis of line-like structures. This extension entails an introduction of free-stream turbulent fluctuations, based on the velocity-based turbulence generation. The aerodynamic response of a longspan bridge is obtained by subjecting the 3D dynamic representation of the structure to correlated free-stream turbulence in twodimensional (2D) fluid planes, which are positioned along the bridge deck. The span-wise correlation of the free-stream turbulence between the 2D fluid planes is established based on Taylor's hypothesis of frozen turbulence. Moreover, the application of the laminar Pseudo-3D VPM is extended to a multimode flutter analysis. Finally, the structural response from the Pseudo-3D flutter and buffeting analyses is verified with the response, computed using the semi-analytical linear unsteady model in the time-domain. Meaningful merits of the turbulent Pseudo-3D VPM with respect to the linear unsteady model are the consideration of the 2D aerodynamic nonlinearity, nonlinear fluid memory, vortex shedding and local non-stationary turbulence effects in the aerodynamic forces. The good agreement of the responses for the two models in the 3D analyses demonstrates the applicability of the Pseudo-3D VPM for aeroelastic analyses of line-like structures under turbulent and laminar free-stream conditions.

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Section: Laminar Pseudo-3d Vortex Particle Methodsmentioning

confidence: 99%

Aeroelastic analyses of bridges using a Pseudo-3D vortex method and velocity-based synthetic turbulence generation

Kavrakov

Morgenthal

2018

Engineering Structures

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“…For three decades vortex-induced vibrations on risers caused by currents and waves have been a critical issue (Kirk et al, 1979;Duggal and Niedzwecki, 1995;Chaplin et al, 1997;Le Cunff et al, 2002).…”

Section: 4mentioning

confidence: 99%

Simulation of fluid-structure interaction for surface ships with linear/nonlinear deformations

Paik¹

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“…The sea current is in y direction and simplified as shear current. The influence of IL VIV is neglected, since the IL VIV is an order of magnitude smaller than the CF VIV [22]. The Euler-Bernoulli theory is applicable for description of TTR dynamic bending.…”

Section: Governing Equationsmentioning

confidence: 99%

Effect of Top Tension on Vortex-Induced Vibration of Deep-Sea Risers

Zhang

Guo

Tang

et al. 2020

JMSE

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With the increase of water depth, the design and use of the top-tensioned risers (TTR) are facing more and more challenges. This research presents the effect of top tension on dynamic behavior of deep-sea risers by means of numerical simulations and experiments. First, the governing equation of vortex-induced vibration (VIV) of TTR based on Euler-Bernoulli theory and Van der Pol wake-oscillator model was established, and the effect of top tension on natural vibration of TTR was discussed. Then, the dynamic response of TTR in shear current was calculated numerically by finite difference method. The displacement, bending stress and vibration frequency of TTR with the variation of top tension were investigated. Finally, a VIV experiment of a 5 m long flexible top-tensioned model was carried out at the towing tank of Tianjin University. The results show that the vibration displacement of TTR increases and the bending stress decreases as the top tension increases. The dominant frequency of VIV of TTR is controlled by the current velocity and is barely influenced by the top tension. With the increase of top tension, the natural frequency of TTR increases, the lower order modes are excited in the same current.

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Vortex-Induced Vibrations of Risers: Theoretical, Numerical and Experimental Investigation

Cited by 28 publications

References 20 publications

Aeroelastic analyses of bridges using a Pseudo-3D vortex method and velocity-based synthetic turbulence generation

Aeroelastic analyses of bridges using a Pseudo-3D vortex method and velocity-based synthetic turbulence generation

Simulation of fluid-structure interaction for surface ships with linear/nonlinear deformations

Effect of Top Tension on Vortex-Induced Vibration of Deep-Sea Risers

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