Active flow control of vortex induced vibrations of a circular cylinder subjected to non-harmonic forcing

Muddada, Sridhar; Patnaik, B.S.V.

doi:10.1016/j.oceaneng.2017.06.036

Cited by 28 publications

(5 citation statements)

References 51 publications

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“…When the angle of attack increases, the best injection angle also increases. Muddada [15] looked into the impact of porous suction on the separated flow at the low Reynolds number on the surface of the airfoil. According to the study, as the suction coefficient rose, the lift/drag ratio first rose quickly and then declined gradually.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Suction Flow Control Technology for a Blunt Trailing Edge Hydrofoil

Yang,

Zhang,

Yan

et al. 2023

Mathematics

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The generation of hydro-mechanical resonance is related to the transition of the boundary layer and the development of vortex shedding. The application effect of suction control in hydrodynamics is equally deserving of consideration as an active control technique in aerodynamics. This study examines how suction control affects the flow field of the NACA0009 blunt trailing edge hydrofoil using the γ transition model. Firstly, the accuracy of the numerical method is checked by performing a three-dimensional hydrofoil numerical simulation. Based on this, three-dimensional hydrofoil suction control research is conducted. According to the results, the suction control increases the velocity gradient in the boundary layer and delays the position of transition. The frequency of vortex shedding in the wake region lowers, and the peak value of velocity fluctuation declines. The hydrofoil hydrodynamic performance may be successfully improved with a proper selection of the suction coefficient via research of the suction coefficient and suction position on the flow field around the hydrofoil. The lift/drag ratio goes up as the suction coefficient goes up. The boundary layer displacement thickness and momentum thickness are at their lowest points, and the velocity fluctuation amplitude in the wake region is at its lowest point as the suction coefficient Cμ = 0.003. When the suction slots are at the leading edge, the momentum loss in the boundary layer is minimal and the velocity fluctuation in the wake zone is negligible.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Suction Flow Control Technology for a Blunt Trailing Edge Hydrofoil

Yang,

Zhang,

Yan

et al. 2023

Mathematics

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show abstract

“…Both passive control and active control are the suppression methods used [4]. Active control requires a large amount of external energy input, high costs, and complex technology [5]. Comparatively, passive control can change the wake structure and even eliminate vortex shedding through the installation of simple auxiliary devices, thus weakening the vortex-induced force [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Layout of a Rigid Splitter Plate on the Flow-Induced Vibration of a Downstream Cylinder Subjected to Wake Flow

Ruan,

Yu,

Bao

et al. 2023

JMSE

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In this study, the effect of additional positions of rigid splitter plates on the response characteristics of tandem cylinders at a Reynolds number of 150 and a fixed distance ratio of 5.0 was numerically investigated via the computational fluid dynamics (CFD) method. Four layouts for the cylinder–plate body, including a downstream cylinder (DC), a downstream cylinder–plate body with a wake side plate (DCP), a downstream plate–cylinder body with an incoming flow side plate (DPC), and a downstream plate–cylinder–plate body with a double-sided plate (DPCP), are considered. The results show that the splitter plate attached to the incoming flow side or the wake side can suppress the vibration of the downstream cylinder in a specific reduced velocity range (4.0 < Ur ≤ 10.0). Compared with the DC, the maximum response amplitude of the DPC and DCP in the lock-in region is reduced by 30.8% and 47.4%, and the lock-in bandwidth is also significantly narrower. The layer separation point of the upstream cylinder moves downstream upon adding splitter plates to both the incoming flow and wake sides, and the resulting splitter shear layer of the DPCP is completely parallel to the free flow, while the maximum response amplitude is reduced by 93.6%, which realizes the best effect of stream-induced vibration suppression.

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“…So far, there has been much research on the reduction of cylinder drag. For example, Muddada and Patnaik [1] significantly reduced the drag induced by eddy current. The method they used was to control the wake vortices by adding two small control cylinders to the rear of the forced cylinder, and the technique was based on the simple active flow control strategy of momentum injection.…”

Section: Introductionmentioning

confidence: 99%

Study of the Drag Reduction Characteristics of Circular Cylinder with Dimpled Surface

Yan

Yang

Wang

2021

Water

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To reduce the drag of a cylinder, numerical simulations and experiments for both smooth cylinder and circular cylinder with the dimpled surface are carried out in this paper. The numerical simulation focuses on the variation of pressure coefficient, skin friction coefficient, and vortex shedding strength of the smooth cylinder and the circular cylinder with the dimpled surface. It is found that the dimpled structure can effectively reduce the drag of the cylinder within a specific range of Reynolds number, and the maximum drag reduction rate reaches up to 19%. Another conclusion is that the pressure drag and skin friction drag have an essential influence on the total drag of the circular cylinder with the dimpled surface. On the other hand, the strength of vortex shedding also decreases with the decrease of cylinder drag. Then, the flow field of both cylinders is measured using the particle image velocimetry (PIV) technique, confirming that the dimpled structure can affect the velocity field, the release of vortices and the scale of the vortex. More specifically, the velocity recovery of the circular cylinder with the dimpled surface is faster than that of the smooth cylinder, and the dimpled structure delays the release of the vortex at a specific range of Reynolds number.

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Active flow control of vortex induced vibrations of a circular cylinder subjected to non-harmonic forcing

Cited by 28 publications

References 51 publications

Numerical Investigation on Suction Flow Control Technology for a Blunt Trailing Edge Hydrofoil

Numerical Investigation on Suction Flow Control Technology for a Blunt Trailing Edge Hydrofoil

The Effect of the Layout of a Rigid Splitter Plate on the Flow-Induced Vibration of a Downstream Cylinder Subjected to Wake Flow

Study of the Drag Reduction Characteristics of Circular Cylinder with Dimpled Surface

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