A fluid–structure interaction simulation on the wake-induced vibration of tandem cylinders with pivoted rotational motion

Lee, Cheol-Min; Paik, Kwang-Jun; Kim, Eun Soo; Lee, Inwon

doi:10.1063/5.0031606

Cited by 14 publications

(2 citation statements)

References 32 publications

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“…However, if the cylinder free to oscillate in cross-flow direction is placed in the wake of an upstream stationary cylinder, its dynamic response of flow-induced vibration (FIV) is characterized by a buildup of oscillation amplitude persisting to high reduced velocities. Moreover, unlike the frequency lock-in of typical VIV response of the isolated cylinder, the frequency of the downstream cylinder is not locked to a specific value close to the structural natural frequency, but linearly increases with the reduced velocity (Bokaian and Geoola, 1984;Brika and Laneville, 1999;Hover and Triantafyllou, 2001;Assi et al, 2010;Li et al, 2018;Zhu et al, 2019;and Lee et al, 2021). Such a characteristic response is referred to as "wake-induced vibration" (WIV).…”

Section: Introductionmentioning

confidence: 99%

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

Triantafyllou

2021

Physics of Fluids

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Flow-induced vibration (FIV) of a flexible cylinder with an upstream wake interference at a subcritical Reynolds number is numerically investigated in this study. Two cylinders are installed in a tandem arrangement with the tandem separation between the cylinder centers set at 5.0 diameters. The downstream cylinder is flexible and placed in the wake of the stationary rigid upstream cylinder. A quasi-threedimensional fluid-structure interaction (FSI) numerical methodology that couples the strip theory-based Lagrangian discrete vortex method with the finite-element method (FEM) for structural dynamics is developed to simulate the FIV response of the flexible cylinder with the upstream wake interference. The vortex-induced vibration (VIV) of an identical isolated cylinder is also numerically simulated as a contrast. This numerical study characterizes the dynamic response of the cylinder FIV with the upstream wake interference and sheds light on the FSI mechanisms responsible for the structural dynamic response. With the upstream wake interference, the cylinder FIV response shows two features distinct from the isolated VIV response: the vibration of large amplitude during the modal resonance branch transition and the extension of the modal resonance branch. The hydrodynamic coefficients database is constructed by the rigid cylinder forced vibration experiment to help explain the FSI properties of the FIV dynamic response. The lower added mass coefficient for the FIV with the upstream wake interference than the VIV of the isolated cylinder guarantees the synchronization between the vortex shedding frequency and the "true" natural frequency of the structure persisting to higher reduced velocity in a certain modal resonance response branch. The excitation coefficient distribution indicates that the cylinder FIV with the upstream wake interference reaches higher amplitude at high reduced velocity, instead of ceasing resonance as the isolated cylinder. The numerical wake visualization is shown and used to explain the correlation between the distribution of hydrodynamic coefficients along the cylinder span and the wake vortex mode. It is found that the upstream wake interference effect is strongly correlated with the vortex-structure interaction pattern between the upstream wake vortices and the downstream motion. When the upstream vortex impinges on the downstream cylinder and splits into subvortices, the effect of the upstream wake interference acting on the downstream cylinder reduces. When the downstream cylinder enters the gap between the upstream vortices over the entire vibration process, the upstream wake has a stronger interference effect on the downstream FIV response.

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Section: Introductionmentioning

confidence: 99%

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

Triantafyllou

2021

Physics of Fluids

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“…Alongside this, they establish that the inclusion of plates could also be promising for power generation using piezoelectric materials. Finally, Lee et al [16] evaluated the fluid-dynamic behaviour and the energy generation capacity of tandem cylinders under Reynolds number values of 3790, 8470, and 15,610. This research considered two operational scenarios, one in which the cylinder in the wake zone describes a translational motion and the other where the cylinder describes a pendular movement with a rotational centre at the fixed vortex-generating cylinder.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Aerodynamic Plates Subjected to Von Kármán Vortex Street for Enhancing the Wind Energy Generation in Blade-Less Devices

Zuluaga,

Ricardo,

Oostra

et al. 2023

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This study explores the feasibility of using an oscillating plate downstream of a cylindrical body to produce mechanical energy from a Von Kármán vortex street under sub-critical flow conditions (Re = 72,500). The study aims to quantify the impact of the plate length, its separation from the cylinder, and a machine damping factor on the power coefficient and the blade’s displacement to identify the optimal configuration. This preliminary assessment assumes that the plate oscillation is small enough to avoid changes in the vortex dynamics. This assumption allows the construction of a surrogate model using Computational Fluid Dynamics (CFD) to evaluate the effect of plate length and separation from the cylinder on the fluctuating lift forces over the plate. Later, the surrogate model, combined with varying machine damping factors, facilitates the description of the device’s dynamics through the numerical integration of an angular momentum equation. The results showed that a plate with a length of 0.52D, a separation of 5.548D from the cylinder, and a damping factor of 0.013 achieved a power coefficient of 0.147 and a perpendicular displacement of 0.226D. These results demonstrate a substantial improvement in the performance of blade-less generators.

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Effect of the geometric configuration of the pendulum system of tandem cylinders (PSTC) on the hydrokinetic energy conversion efficiency of wake-induced vibration

et al. 2023

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A fluid–structure interaction simulation on the wake-induced vibration of tandem cylinders with pivoted rotational motion

Cited by 14 publications

References 32 publications

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

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

Assessment of Aerodynamic Plates Subjected to Von Kármán Vortex Street for Enhancing the Wind Energy Generation in Blade-Less Devices

Effect of the geometric configuration of the pendulum system of tandem cylinders (PSTC) on the hydrokinetic energy conversion efficiency of wake-induced vibration

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