Flow-induced vibration of high-mass ratio isolated and tandem flexible cylinders with fixed boundary conditions

Seyed-Aghazadeh, Banafsheh; Anderson, Nathaniel; Dulac, Sarah

doi:10.1016/j.jfluidstructs.2021.103276

Cited by 14 publications

(21 citation statements)

References 44 publications

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“…In the entire range of reduced velocity for which the FIV response follows a VIV-type response (U * = 4.73-10.77), the frequency content of the response shows a mono-frequency oscillation. The frequency of oscillations follows the Strouhal line, which was measured for a rigid stationary triangular cylinder at this angle of attack (Seyed-Aghazadeh et al 2017) and is shown with a dashed line in this figure. Unlike the VIV response of a flexible circular cylinder, in which the non-dimensional frequency of the oscillation locks into a specific frequency at each mode of oscillation (Mousavisani et al 2022a), the oscillation frequency of the triangular cylinder at α = 0 • follows the Strouhal line within the VIV-type response region.…”

Section: Response Characteristics For the Angle Of Attack Of α = 0 •mentioning

confidence: 78%

“…Our study observes and discusses these effects in the following sections. The excitation of higher modes and fixed boundary conditions at both ends presumably is the reason for the smaller amplitude of oscillation, distinguishing the FIV response of the flexible and rigid triangular cylinder from the unbounded increase in amplitude previously observed in the galloping response of rigid, flexibly mounted triangular prisms (Seyed-Aghazadeh et al 2017).…”

Section: Overview Of the Cylinder's Vibration Responsementioning

confidence: 80%

“…When a rigid triangular prism is flexibly mounted and allowed to oscillate in the cross-flow direction, its FIV response can be classified as either vortex-induced vibration (VIV) or galloping with a large amplitude and low oscillation frequency, depending on the angle of attack and flow velocity (Seyed-Aghazadeh et al 2017;Chen et al 2020;Liu et al 2020). Both experimental and numerical investigations have been conducted on such systems to highlight the effects of the angle of attack on the system's FIV response (Alonso, Meseguer & Pérez-Grande 2005;Alonso & Meseguer 2006;Alonso, Meseguer & Pérez-Grande 2007;Alonso, Sanz-Lobera & Meseguer 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The study showed that based on the prism's angle of attack, the FIV response type could be categorised into three regimes of VIV, galloping and the combined VIV and galloping. In another study, the FIV of a flexibly mounted triangular prism with the mass ratio of m * = 9.24 has been studied through a series of water tunnel experiments, covering the response in the Reynolds number range of Re = 490-2700 (Seyed-Aghazadeh et al 2017). The effect of the angle of attack and flow velocity on the FIV response was studied through the structural response of the prism together with the vortex dynamics and shedding patterns in the wake of the prism.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of flow-induced vibration and flow field characteristics of a flexible triangular cylinder

Mousavisani,

Samandari,

Seyed-Aghazadeh

2024

J. Fluid Mech.

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Flow-induced vibration (FIV) of a flexible cylinder with a triangular cross-section, allowed to oscillate in the cross-flow, inline and torsional direction, is studied experimentally through water tunnel tests. The dynamic response of the cylinder was studied for three different angles of attack ( $0^\circ, 30^\circ, 60^\circ$ ), at reduced velocities of 0.9–16.27, corresponding to Reynolds numbers of 364–3600. At the angle of attack of $0^\circ$ , vortex-induced vibration at low reduced velocity was observed, which transitioned to galloping at higher reduced velocities. At the angles of attack of $30^\circ$ and $60^\circ$ , galloping-type response was observed over the range of the reduced velocities tested. Our results show that the cylinder's torsional oscillation breaks the system's symmetry and affects the structural response at higher reduced velocities regardless of the angle of attack. The FIV response of the flexible triangular cylinder is distinct from that of a rigid flexibly mounted triangular cylinder due to torsional oscillation, spanwise flexibility and the two fixed boundary conditions limiting the amplitude of oscillation. Flow field analysis in the wake of the cylinder was done qualitatively and quantitatively using hydrogen bubble flow visualisation and time-resolved volumetric particle tracking velocimetry techniques, respectively. Our results show the existence of highly three-dimensional vortex structures in the wake of the cylinder. We studied the coupling between the vortex shedding modes in the wake of the cylinder and the structural vibration modes through the spatiotemporal mode analysis using the proper orthogonal decomposition technique to distinguish between different types of the FIV response observed.

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Section: Response Characteristics For the Angle Of Attack Of α = 0 •mentioning

confidence: 78%

Section: Overview Of the Cylinder's Vibration Responsementioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental investigation of flow-induced vibration and flow field characteristics of a flexible triangular cylinder

Mousavisani,

Samandari,

Seyed-Aghazadeh

2024

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%

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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Numerical Investigation of Damped Vibrations in Slender Flexible Structures

Dirbude,

Iyer

2024

Lecture Notes in Mechanical Engineering

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Flow-induced vibration of high-mass ratio isolated and tandem flexible cylinders with fixed boundary conditions

Cited by 14 publications

References 44 publications

Experimental investigation of flow-induced vibration and flow field characteristics of a flexible triangular cylinder

Experimental investigation of flow-induced vibration and flow field characteristics of a flexible triangular cylinder

Flexible cylinder flow-induced vibration

Numerical Investigation of Damped Vibrations in Slender Flexible Structures

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