Modes of vortex formation and transition to three-dimensionality in the wake of a freely vibrating cylinder

Du, Lin; Ji, Xiaodong; Sun, Xiaofeng

doi:10.1016/j.jfluidstructs.2014.05.012

Cited by 38 publications

(31 citation statements)

References 33 publications

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“…These asymmetric wakes resulted in flow forces both with the first and the second harmonics in the crossflow direction. The occurrence of the second harmonic in the crossflow direction for a vertical cylinder undergoing VIV has been recently observed and discussed by Du et al [29].…”

Section: Force Measurement Phase Differences and Higher Harmonic Forcesmentioning

confidence: 84%

The influence of higher harmonic flow forces on the response of a curved circular cylinder undergoing vortex-induced vibration

Seyed-Aghazadeh

Budz

Modarres‐Sadeghi

2015

Journal of Sound and Vibration

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Section: Force Measurement Phase Differences and Higher Harmonic Forcesmentioning

confidence: 84%

The influence of higher harmonic flow forces on the response of a curved circular cylinder undergoing vortex-induced vibration

Seyed-Aghazadeh

Budz

Modarres‐Sadeghi

2015

Journal of Sound and Vibration

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“…The study conducted by Du et al 22 shows that the flow transition to three-dimensionality is postponed by the cylinder vibration. As observed in Poncet's computational study, 30 conducted by Korkischko and Meneghini 12 suggested that, by using MSBC (U c /U ∞ ≥ 5), the amplitude A * can be reduced to 0.1-0.2 in the range U * = 4.0-8.0.…”

Section: E a Three-dimensional Examplementioning

confidence: 99%

“…The IB method uses a regular Eulerian computational grid for the fluid mechanics together with a Lagrangian representation of the immersed boundary. For more details about the IB method used in the present work, the reader is referred to the work conducted by Du et al 22 In this simulation, drag and lift force coefficients are used to quantify the hydrodynamic characteristics. The definitions are also given here…”

Section: A the Flow Equationsmentioning

confidence: 99%

“…The results reported by Prasanth et al 24,25 indicated that the behaviors of VIV are affected by the blockage effects. Three different domain sizes are tested for the influence on VIV from the blockage effects in the study by Du et al 22 The domain size with L x1 = 8D, L x2 = 24D, and L y = 24D is used in the present work. The mean drag coefficientsC x , and fluctuating drag and lift coefficients C ′ x and C ′ y (the maximum deviation from the means) are given in Table II with three spatial resolutions.…”

Section: Reduced Velocitymentioning

confidence: 99%

“…In Zhong and Sun's study, 21 an oscillating cascade was simulated by using the immersed boundary method, especially, some complicated non-linear coupling phenomena were captured. The present method has been used to study the modes of vortex formation and transition to three-dimensionality in the wake of a freely vibrating cylinder by Du et al 22 In this study, the VIV of a rotationally oscillating cylinder is numerically studied with zero structural damping coefficient to obtain maximum response. The rotary oscillation frequency f r ranges from 0.3 to 5.0.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Suppression of vortex-induced vibration using the rotary oscillation of a cylinder

Sun

2015

Physics of Fluids

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An active control method for suppressing the response of an elastically mounted cylinder by forcing rotary oscillation is presented. Vortex-induced vibration (VIV) of structures is related to the interaction between body and shedding vortex. In the synchronization/lock-in regime, when the vortex shedding frequency f s matches the natural frequency f N of the spring-mass system, large displacement amplitude in the transverse direction is observed. The effect of rotary oscillation on unsteady laminar flow past a freely vibrating cylinder has been investigated. In this study, the cylinder has two degrees of freedom: forced rotary oscillation and vortex induced vibration. The investigation is based on the solutions of flow equations by using the immersed boundary method at moderate Reynolds number. The present computational results indicate the rotary oscillation control can be implemented to suppress the response amplitude of VIV by locking the vortex shedding frequency f s at the forcing frequency f r in the "lock-on" region. The "lock-on" phenomenon occurs in the wake of a rotationally oscillating cylinder, which is free to vibrate in the transverse direction. The essence of the present active control method is to change the frequency of the vortex shedding, rather than suppress it. The response of an elastically mounted cylinder is drastically suppressed to less than 1% of the cylinder diameter, when proper frequency ratio f r / f N and rotational velocity are imposed. Detailed analyses of aerodynamic performance are given to interpret the mechanism of the suppression of response caused by forced rotary oscillation. The effects of mass ratio and velocity rate of rotary oscillation are also found to play an important role in the spring-mass system. The efficiency of the present method increases with Reynolds number. C 2015 AIP Publishing LLC. [http://dx.

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Adaptive mesh refinement for simulating fluid‐structure interaction using a sharp interface immersed boundary method

Wang

Sun

2020

Numerical Methods in Fluids

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Summary In this article, adaptive mesh refinement (AMR) is performed to simulate flow around both stationary and moving boundaries. The finite‐difference approach is applied along with a sharp interface immersed boundary (IB) method. The Lagrangian polynomial is employed to facilitate the interpolation from a coarse to a fine grid level, while a weighted‐average formula is used to transfer variables inversely. To save memory, the finest grid is only generated in the local areas close to the wall boundary, and the mesh is dynamically reconstructed based on the location of the wall boundary. The Navier‐Stokes equations are numerically solved through the second‐order central difference scheme in space and the third‐order Runge‐Kutta time integration. Flow around a circular cylinder rotating in a square domain is firstly simulated to examine the accuracy and convergence rate. Then three cases are investigated to test the validity of the present method: flow past a stationary circular cylinder at low Reynolds numbers, flow past a forced oscillating circular cylinder in the transverse direction at various frequencies, and a free circular cylinder subjected to vortex‐induced vibration in two degrees of freedom. Computational results agree well with these in the literature and the flow fields are smooth around the interface of different refinement levels. The effect of refinement level has also been evaluated. In addition, a study for the computational efficiency shows that the AMR approach is helpful to reduce the total node number and speed up the time integration, which could prompt the application of the IB method when a great near‐wall spatial resolution is required.

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Modes of vortex formation and transition to three-dimensionality in the wake of a freely vibrating cylinder

Cited by 38 publications

References 33 publications

The influence of higher harmonic flow forces on the response of a curved circular cylinder undergoing vortex-induced vibration

The influence of higher harmonic flow forces on the response of a curved circular cylinder undergoing vortex-induced vibration

Suppression of vortex-induced vibration using the rotary oscillation of a cylinder

Adaptive mesh refinement for simulating fluid‐structure interaction using a sharp interface immersed boundary method

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