An experimental investigation of vortex-induced vibration of a curved flexible cylinder

Seyed-Aghazadeh, Banafsheh; Benner, Bridget; Gjokollari, Xhino; Modarres‐Sadeghi, Yahya

doi:10.1017/jfm.2021.725

Cited by 13 publications

(10 citation statements)

References 46 publications

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“…Comprehensive studies of the concave configuration were carried out by, among others, Miliou et al (2007), Shang et al (2018), Jiang, Pettersen & Andersson (2018a, Jiang et al (2018b), Chiatto et al (2021Chiatto et al ( , 2023 and Lee et al (2020), who investigated a curved cylinder at several inflow angles. Vortex-induced vibration of curved cylinders was studied by de Vecchi, Sherwin & Graham (2008), Assi et al (2014), Seyed-Aghazadeh, Budz & Modarres-Sadeghi (2015), Seyed-Aghazadeh et al (2021), Srinil, Ma & Zhang (2018) and Ma & Srinil (2023).…”

Section: Single Curved Cylindersmentioning

confidence: 99%

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Flow topology in the gap and wake of convex curved tandem cylinders

Aasland,

Pettersen,

Andersson

et al. 2023

J. Fluid Mech.

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Flow around curved tandem cylinders in the convex configuration has been studied by means of direct numerical simulations, for a Reynolds number of 500 and a nominal gap ratio of 3.0. Spanwise variation of flow regimes, as well as curvature-induced axial velocity, leads to an exceedingly complex vortex dynamics in the wake. Both parallel and oblique vortex shedding are observed. Oblique shedding is connected to repeated occurrences of dislocations. The dislocations are caused by two main mechanisms: frequency differences in the upper part of the curved geometry and shedding of gap vortices into the lower near wake. Both types of dislocations are closely associated with a mode switch in the gap. In parts of the gap, there is low-frequency quasi-periodic asymmetry of the gap vortices, where the flow is biased to one side of the gap for intervals of several wake vortex shedding periods. The switch from side to side is associated with a surge of the vertical velocity, and the frequency of the switch is similar to that of long-term variation of the recirculation length in the lower gap.

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Section: Single Curved Cylindersmentioning

confidence: 99%

“…(2014), Seyed-Aghazadeh, Budz & Modarres-Sadeghi (2015), Seyed-Aghazadeh et al. (2021), Srinil, Ma & Zhang (2018) and Ma & Srinil (2023).…”

Section: Introductionmentioning

confidence: 99%

Flow topology in the gap and wake of convex curved tandem cylinders

Aasland,

Pettersen,

Andersson

et al. 2023

J. Fluid Mech.

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“…2005; Lie & Kaasen 2006; Huera-Huarte & Bearman 2009; Seyed-Aghazadeh, Edraki & Modarres-Sadeghi 2019; Seyed-Aghazadeh et al. 2021 b ), and numerical studies (Evangelinos, Lucor & Karniadakis 2000; Bourguet, Karniadakis & Triantafyllou 2011 a ; Bourguet et al. 2011 b ; Bourguet, Karniadakis & Triantafyllou 2013; Zanganeh & Srinil 2016), excitation of mono- and multi-frequency modes and transition from lower-mode to higher-mode excitation have been observed in the VIV response of such flexible cylinders.…”

Section: Introductionmentioning

confidence: 99%

“…2011; Bourguet, Lucor & Triantafyllou 2012; Seyed-Aghazadeh et al. 2021 b ; Mousavisani, Castro & Seyed-Aghazadeh 2022 a ) adds to the complexity of the response that cannot be characterised in simpler models of a flexible cylinder, i.e. flexibly mounted cylinder studies with one or two degrees of freedom.…”

Section: Introductionmentioning

confidence: 99%

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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“…2011; Bourguet, Lucor & Triantafyllou 2012; Seyed-Aghazadeh et al. 2021) adds to the complexity of the response that cannot be characterized in simpler models of a flexible cylinder, i.e. flexibly mounted cylinder studies with one or two DOF.…”

Section: Introductionmentioning

confidence: 99%

Vortex-induced vibration of a two degree-of-freedom flexibly mounted circular cylinder in the crossflow direction

et al. 2022

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Vortex-induced vibration (VIV) of a two degree-of-freedom (DOF) circular cylinder, placed in the test section of a recirculating water tunnel and free to oscillate in its first two vibrational modes in the crossflow direction, is studied experimentally. The dynamic response of the cylinder is studied for a reduced velocity range of $U^*=4\unicode{x2013}30$ for eigenfrequency ratios in the range of 1.3–3.0. For the two DOF system, while the onset of the VIV response followed a similar lock-in region as those observed for a classical VIV response of a single DOF system, by increasing the reduced velocity a secondary lock-in region was observed over which the oscillations of the cylinder were locked into the system's second mode. In addition, there existed an intermediate range of reduced velocity over which the VIV response consisted of oscillations at a combination of the first two natural modes of the system. As the eigenfrequency ratio between the first two modes increased, the secondary lock-in range was extended to higher reduced velocities and the reduced velocity range over which multi-modal oscillations were observed was decreased. A full map of vortex dynamics in the wake of the cylinder was developed qualitatively and quantitatively using hydrogen bubble flow visualization and time-resolved volumetric particle tracking velocimetry techniques, respectively. A Q-criterion analysis revealed the existence of highly three-dimensional vortex structures in the wake of the cylinder. The spatiotemporal mode analysis using the proper orthogonal decomposition technique revealed strong coupling between the vortex shedding modes in the wake of the cylinder and the structural vibration modes.

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An experimental investigation of vortex-induced vibration of a curved flexible cylinder

Cited by 13 publications

References 46 publications

Flow topology in the gap and wake of convex curved tandem cylinders

Flow topology in the gap and wake of convex curved tandem cylinders

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

Vortex-induced vibration of a two degree-of-freedom flexibly mounted circular cylinder in the crossflow direction

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