Two-degree-of-freedom flow-induced vibration of two circular cylinders with constraint for different arrangements

Zou, Qunfeng; Ding, Lin; Zou, Rui; Kong, Hao; Wang, Haibo; Zhang, Li

doi:10.1016/j.oceaneng.2021.108806

Cited by 17 publications

(5 citation statements)

References 42 publications

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“…The result shows that at low flow velocity U* < 7, the vibration can be damped, while at higher flow velocity U* ≥ 7, the oscillation increases. In addition, in the tandem arrangement, the vibration is smaller [18].…”

Section: Introductionmentioning

confidence: 91%

“…The lift force on the outer side occurs at a distance of P/D=3 -4 and angle=20°, due to the interaction between the vortices that are released from the upstream cylinder and re-attaches to the downstream cylinder. Experimental test of flow passing through two circular cylinders arranged side by side, tandem, and staggered has also been studied [18]. The result shows that at low flow velocity U* < 7, the vibration can be damped, while at higher flow velocity U* ≥ 7, the oscillation increases.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Behaviour of Flow Through Three Circular Cylinders in Staggered Arrangement with Three Disturbance Bodies Around the Upstream Cylinder

Sutardi

2023

JMechE

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Studies on flow through cylinders have been widely carried out, both experimentally and numerically. The purpose of those studies is to obtain information about flow phenomena around the cylinder arrangement, such as aerodynamic forces, vortex shedding, and vortex-induced vibration. This study aims to evaluate the flow characteristics that pass through three circular cylinders arranged in a stagger and reduce the drag force (CD) by adding 3 disturbance bodies (DB) around the upstream cylinder. The longitudinal distance L/D varies from 1.5 to 4.0, while the transversal distance T/D is kept constant. Next, the diameter ratio d/D is set to 0.16. The diameter of cylinder 1, D=25 mm, and the diameter of the DB, d=4 mm. The DB is placed around cylinder 1 at three angle locations with a gap, δ=4 mm. The study is performed using Ansys fluent® 19.1 software in 2-D unsteady RANS with the transition k-kl-omega turbulence model. The flow Reynolds number based on D is22x104. The results showed that the L/D and the use of DB affect the cylinderdrag coefficient (CD). There is a CD reduction for cylinder 1 up to 20% atL/D=3.0. For cylinders 2 and 3, the reduction in CD occurred at L/D=4.0 upto approximately 13% and 17%, respectively.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Dynamic Behaviour of Flow Through Three Circular Cylinders in Staggered Arrangement with Three Disturbance Bodies Around the Upstream Cylinder

Sutardi

2023

JMechE

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“…Galerkin FEM method was used by [64][65][66][67]. Whereas the renowned fourth-order Runge-Kutta algorithm was used by [11,13,68,69].…”

Section: Governing Equations For Fivmentioning

confidence: 99%

Flow-Induced Vibrations of Single and Multiple Heated Circular Cylinders: A Review

et al. 2021

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This study is an effort to encapsulate the fundamentals and major findings in the area of fluid-solid interaction, particularly the flow-induced vibrations (FIV). Periodic flow separation and vortex shedding stretching downstream induce dynamic fluid forces on the bluff body and results in oscillatory motion of the body. The motion is generally referred to as flow-induced vibrations. FIV is a dynamic phenomenon as the motion, or the vibration of the body is subjected to the continuously changing fluid forces. Sometimes FIV is modeled as forced vibrations to mimic the vibration response due to the fluid forces. FIV is a deep concern of engineers for the design of modern heat exchangers, particularly the shell-and-tube type, as it is the major cause for the tube failures. Effect of important parameters such as Reynolds number, spacing ratio, damping coefficient, mass ratio and reduced velocity on the vibration characteristics (such as Strouhal number, vortex shedding, vibration frequency and amplitude, etc.) is summarized. Flow over a bluff body with wakes developed has been studied widely in the past decades. Several review articles are available in the literature on the area of vortex shedding and FIV. None of them, however, discusses the cases of FIV with heat transfer. In particular systems, FIV is often coupled to heat transfer, e.g., in nuclear power plants, FIV causes wear and tear to heat exchangers, which can eventually lead to catastrophic failure. As the circular shape is the most common shape for tubes and pipes encountered in practice, this review will only focus on the FIV of circular cylinders. In this attempt, FIV of single and multiple cylinders in staggered arrangement, including tandem and side-by-side arrangement is summarized for heated and unheated cylinder(s) in the one- and two-degree of freedom. The review also synthesizes the effect of fouling on heat transfer and flow characteristics. Finally, research prospects for heated circular cylinders are also stated.

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“…Zou Q et al investigated four arrangements of two cylinders via simulation, and the amplitude of two rigidly connected cylinders was larger than that of independently vibrating cylinders when U* > 9. The motion trajectories of the cylinders under two degrees of freedom were also investigated, and certain motion laws were given [38]. Liu et al conducted a study on two parallel elasticconnected cylinders and found that the stiffness ratio and spacing ratio of the structure could affect the amplitude of the structure and the size of the locking interval.…”

Section: Introductionmentioning

confidence: 99%

Study of Hydrokinetic Energy Harvesting of Two Tandem Three Rigidly Connected Cylinder Oscillators Driven by Fluid-Induced Vibration

Chao,

Luo,

Yang

et al. 2024

JMSE

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This study utilizes a bidirectional fluid–structure interaction numerical method to investigate the hydrodynamic and energy harvesting characteristics of two tandem three rigidly connected cylinder oscillators with different inter-oscillator spacing ratios. The analysis considers inter-oscillator spacing ratios of 8, 12, and 16 within a reduced velocity range of U* = 2–13 (equivalent to flow velocities of 0.18–1.16 m/s). The research explores the hydrodynamic interference features, energy harvesting variations, and the efficiency and density of energy harvesting of both upstream and downstream three-cylinder oscillators. The findings indicate that with increasing reduced velocity and inter-oscillator spacing ratio, the mutual interference between upstream and downstream oscillators diminishes. Wake patterns observed in the two series-connected three-cylinder oscillators include 2P, 2S, and 2T patterns, with fragmented vortices and banded vortices at specific reduced velocities. The most significant disparity in energy harvesting efficiency between upstream and downstream oscillators is observed at U* = 9.

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Two-degree-of-freedom flow-induced vibration of two circular cylinders with constraint for different arrangements

Cited by 17 publications

References 42 publications

Dynamic Behaviour of Flow Through Three Circular Cylinders in Staggered Arrangement with Three Disturbance Bodies Around the Upstream Cylinder

Dynamic Behaviour of Flow Through Three Circular Cylinders in Staggered Arrangement with Three Disturbance Bodies Around the Upstream Cylinder

Flow-Induced Vibrations of Single and Multiple Heated Circular Cylinders: A Review

Study of Hydrokinetic Energy Harvesting of Two Tandem Three Rigidly Connected Cylinder Oscillators Driven by Fluid-Induced Vibration

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