Flow-induced cross-flow vibrations of long flexible cylinder with an upstream wake interference

Triantafyllou, Michael S.

doi:10.1063/5.0053826

Cited by 26 publications

(9 citation statements)

References 48 publications

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“…Second, for the plant within the vegetation patch, the vibration of the plant is affected by the wakes and vortices of the surrounding plants instead of its own wake, referred to as wake-induced vibration (Lin et al. 2021). Third, the plant, in this study, is actually a series of flexible bodies if we take each pellet as a tethered sphere, and this undoubtedly brings up a higher degree of freedom of the flexible body and makes the swaying behaviour more complex.…”

Section: Further Discussionmentioning

confidence: 99%

Swaying motions of submerged flexible vegetation

Fu,

He,

Huang

et al. 2023

J. Fluid Mech.

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Submerged vegetation plays a subtle role in exchanging the fluid mass and energy in the vegetated flow zone, where the swaying motions of flexible plants are the important source of turbulent kinetic energy production. Flume experiments were conducted to study the modes, characteristics and factors of swaying of individual submerged flexible plants. A modified plant model in a new form, representing the highly flexible vegetation with clustered leaves, was employed. A ‘rigid-like’ synchronous swaying mode and a ‘whip-like’ asynchronous flapping mode are found to appear alternately for the individual plants. The interaction between these modes depends on the resulting local flow structure affected by the plants. Compared with a plant in isolation with the same flow Reynolds number, the swaying motions of a plant within the vegetation patch are less frequent but more prone to the synchronous mode. The eigen frequency of the motions increases linearly with an increase in flow Reynolds number in the range of 2 × 104–5 × 104, but the normalised amplitude reaches a saturation at a high flow Reynolds number. Moreover, the in-line and spanwise motions have a 2 : 1 frequency ratio for an ‘8’ shaped trajectory on the horizontal plane and a 1 : 1 ratio for a ‘0’ shaped circular trajectory, or a combination of both.

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Section: Further Discussionmentioning

confidence: 99%

Swaying motions of submerged flexible vegetation

Fu,

He,

Huang

et al. 2023

J. Fluid Mech.

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“…These two characters have been further investigated and confirmed in various other experimental and numerical studies. 148,[150][151][152] The studies showed that lower modal resonance persisted over an extensive range…”

Section: Structural Response Characters Of Multiple Flexible Cylinder...mentioning

confidence: 99%

“…Numerical simulation is an alternative and complementary approach to reveal 3D wake topology along the model span. In the past numerical studies, 148,162,163 one of the key findings obtained is that the correlation length of the spanwise wake vortical structure can be not only modified by the structural motion but also by the wake interference effect from the other cylinder. 162 Lin et al 148 first revealed that the wake interference process is distributed along the flexible model span.…”

Section: Reviewmentioning

confidence: 99%

“…In the past numerical studies, 148,162,163 one of the key findings obtained is that the correlation length of the spanwise wake vortical structure can be not only modified by the structural motion but also by the wake interference effect from the other cylinder. 162 Lin et al 148 first revealed that the wake interference process is distributed along the flexible model span. The wake interference effect is highly associated with the coherence of upstream wake vortices.…”

Section: Reviewmentioning

confidence: 99%

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Flexible cylinder flow-induced vibration

Lin

Fan

et al. 2022

Physics of Fluids

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In this paper, we conducted a selective review on the recent progress in physics insight and modeling of flexible cylinder flow-induced vibrations (FIVs). FIVs of circular cylinders include vortex-induced vibrations (VIVs) and wake-induced vibrations (WIVs), and they have been the center of the fluid-structure interaction (FSI) research in the past several decades due to the rich physics and the engineering significance. First, we summarized the new understanding of the structural response, hydrodynamics, and the impact of key structural properties for both the isolated and multiple circular cylinders. The complex FSI phenomena observed in experiments and numerical simulations are explained carefully via the analysis of the vortical wake topology. Following up with several critical future questions to address, we discussed the advancement of the artificial intelligent and machine learning (AI/ML) techniques in improving both the understanding and modeling of flexible cylinder FIVs. Though in the early stages, several AL/ML techniques have shown success, including auto-identification of key VIV features, physics-informed neural network in solving inverse problems, Gaussian process regression for automatic and adaptive VIV experiments, and multi-fidelity modeling in improving the prediction accuracy and quantifying the prediction uncertainties. These preliminary yet promising results have demonstrated both the opportunities and challenges for understanding and modeling of flexible cylinder FIVs in today's big data era.

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“…Recent progress in the development of discrete vortex methods has particularly concentrated on improvements in the accuracy of numerical results and the high resolution of wake fields [7][8][9][10][11][12][13][14][15][16]. Some of the literature has also focused on the extension of the vortex method, such as solving structural deformations via coupling with the finite element method [17][18][19][20][21]. In vortex methods, vortices already in the fluid can leak into the body owing to random walk, which causes serious damage to the streamlined body surface.…”

Section: Introductionmentioning

confidence: 99%

Conformal Mapping-Based Discrete Vortex Method for Simulating 2-D Flows around Arbitrary Cylinders

Guo

Sun

Zong

et al. 2021

JMSE

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A novel technique based on conformal mapping and the circle theorem has been developed to tackle the boundary penetration issue, in which vortex blobs leak into structures in two-dimensional discrete vortex simulations, as an alternative to the traditional method in which the blobs crossing the boundary are simply removed from the fluid field or reflected back to their mirror-image positions outside the structure. The present algorithm introduces an identical vortex blob outside the body using the mapping method to avoid circulation loss caused by the vortex blob penetrating the body. This can keep the body surface streamlined and guarantees that the total circulation will be constant at any time step. The model was validated using cases of viscous incompressible flow passing elliptic cylinders with various thickness-to-chord ratios at Reynolds numbers greater than Re = 1 × 105. The force and velocity fields revealed that this boundary scheme converged, and the resultant time-averaged surface pressure distributions were all in excellent agreement with wind tunnel tests. Furthermore, a flow around a symmetrical Joukowski foil at Reynolds number Re = 4.62 × 104, without considering the trailing cusp, was investigated, and a close agreement with the experimental data was obtained.

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Flow-induced cross-flow vibrations of long flexible cylinder with an upstream wake interference

Cited by 26 publications

References 48 publications

Swaying motions of submerged flexible vegetation

Swaying motions of submerged flexible vegetation

Flexible cylinder flow-induced vibration

Conformal Mapping-Based Discrete Vortex Method for Simulating 2-D Flows around Arbitrary Cylinders

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