On Cross Flow-Induced Vibration of a Flexible Cylinder

Cen, Haoyang; Ting, David S.‐K.; Carriveau, Rupp

doi:10.1115/imece2014-38642

Cited by 1 publication

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“…At each end, there is an endplate featuring a smoothly curved profile designed to minimise the flow's three-dimensionality, resulting in a blockage ratio of 4 %. The system's bending and torsional natural frequencies and damping ratio were measured using free decay tests, employing a technique established previously and discussed in the literature (Cen 2015;Seyed-Aghazadeh et al 2021b). The damping ratio of the system in the air, obtained using free decay tests, was calculated to be ζ = 0.003.…”

Section: Experimental Set-up and Data Collectionmentioning

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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Section: Experimental Set-up and Data Collectionmentioning

confidence: 99%