Vortex-induced travelling waves along a cable

Facchinetti, Matteo Luca; Langre, Emmanuel de; Biolley, F.

doi:10.1016/j.euromechflu.2003.04.004

Cited by 77 publications

(42 citation statements)

References 20 publications

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“…In between the two end regions, traveling waves can be observed. The same dynamic behavior has been reproduced using DNS approach [14] and model testing [15] . Moreover, the occurrence of traveling waves would be affected by the towing speed.…”

Section: Case Studymentioning

confidence: 99%

Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators

Wang

et al. 2009

Sci. China Ser. G-Phys. Mech. Astron.

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The dynamics of long slender cylinders undergoing vortex-induced vibrations (VIV) is studied in this work. Long slender cylinders such as risers or tension legs are widely used in the field of ocean engineering. When the sea current flows past a cylinder, it will be excited due to vortex shedding. A three-dimensional time domain model is formulated to describe the response of the cylinder, in which the in-line (IL) and cross-flow (CF) deflections are coupled. The wake dynamics, including in-line and cross-flow vibrations, is represented using a pair of non-linear oscillators distributed along the cylinder. The wake oscillators are coupled to the dynamics of the long cylinder with the acceleration coupling term. A non-linear fluid force model is accounted for to reflect the relative motion of cylinder to current. The model is validated against the published data from a tank experiment with the free span riser. The comparisons show that some aspects due to VIV of long flexible cylinders can be reproduced by the proposed model, such as vibrating frequency, dominant mode number, occurrence and transition of the standing or traveling waves. In the case study, the simulations show that the IL curvature is not smaller than CF curvature, which indicates that both IL and CF vibrations are important for the structural fatigue damage.

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Section: Case Studymentioning

confidence: 99%

Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators

Wang

et al. 2009

Sci. China Ser. G-Phys. Mech. Astron.

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“…In the limiting case, where the towed body is very small or missing completely, theory predicts that the towed cable is straight rather than curved as it hangs in the water (Dowling, 1988a;Dowling, 1988b). The straight line shape, in the direction of towing motion, has been confirmed by experiment (Facchinetti et al, 2002). Most related studies employ the straight line shape as the baseline to predict outof-plane cable oscillations, which are immaterial to trolled fishing line prediction.…”

Section: Introductionmentioning

confidence: 81%

Sink depth of trolled fishing lines

Spolek

2007

Sports Eng

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During recreational troll fishing, success usually depends on the ability to maintain the lure at the desired depth. When trolling with a heavy line, one whose inherent density sinks the lure, depth control is guesswork for most anglers. This study presents a method for predicting the trolling depth of heavy fishing lines. The model is developed based on the fluid mechanics of the line being towed through quiescent water and determines line depth for known line properties and trolling speed. Experiments are performed to validate the model and results are consistent with the model predictions. The model is employed to illustrate how trolling depth can be controlled during typical fishing situations.

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“…Because the process of vortex separation is evidently of a self-oscillatory character [11,12,14,15,16], and the streamlined body represents an oscillatory element with one or several natural frequencies, the stall flutter phenomenon must be similar to self-oscillations in a system containing both active and passive oscillatory elements. In this paper we therefore model stall flutter as an interaction phenomenon arising between a self-excited oscillator (the flow oscillator) [14,15,16] corresponding to the periodic vortex separation, and a passive oscillator (the elastic cylinder around which the fluid flows).…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we therefore model stall flutter as an interaction phenomenon arising between a self-excited oscillator (the flow oscillator) [14,15,16] corresponding to the periodic vortex separation, and a passive oscillator (the elastic cylinder around which the fluid flows). Note that the problems of this type were first investigated and solved by physicists of the Mandelstam school in Moscow (including A. Andronov, A. Witt, S. Strelkov and A. Skibarko), in 1934.…”

Section: Introductionmentioning

confidence: 99%

Æolian tones and stall flutter of lengthy objects in fluid flows

Landa

McClintock

2010

J. Phys. A: Math. Theor.

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Abstract. We consider theoretically the spontaneous oscillations of an elastic cylinder in a streaming fluid flow. Such oscillations are responsible for stall flutter in e.g. turbine blades and bridges, or AEolian tones when in the acoustic range. The process of vortex separation from the oscillating surface is modelled as a self-excited oscillator. The vortex separation frequency remains synchronized with the oscillations of the cylinder over a great range of frequency mismatches, enabling the amplitudes and frequencies to be calculated. Only when the vortex separation frequency is much less than the cylinder's natural oscillation frequency does the synchronization break down, and two-frequency oscillations (beats) then occur.

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Vortex-induced travelling waves along a cable

Cited by 77 publications

References 20 publications

Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators

Flow-induced vibrations of long circular cylinders modeled by coupled nonlinear oscillators

Sink depth of trolled fishing lines

Æolian tones and stall flutter of lengthy objects in fluid flows

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