Suppression of vortex-induced vibration of a circular cylinder by a passive-jet flow control

Chen, Wenli; Chen, Guan-Bin; Xu, Feng; Huang, Yewei; Li, Hui

doi:10.1016/j.jweia.2020.104119

Cited by 58 publications

(11 citation statements)

References 29 publications

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“…The lowest velocity of the case Jsj = 0 was less than that of the case Jsj = 0.0094 at X/B = 0.03 and 0.12 because the jet flow can alleviate the velocity defect. That indicates the inner region flow field behind case Jsj = 0.0094 is more stable than the case Jsj = 0 [6]. Conversely, the smallest value of the velocity of the case Jsj = 0 was larger than that of case The Reynolds shear stress (RSS), which serves as an essential parameter to represent the turbulence in the flow structure, is calculated and given in Figure 12.…”

Section: Piv Measurement Resultsmentioning

confidence: 96%

“…The VIV is the primary issue that is caused by airflow in bridge engineering because it occurs at a low velocity (e.g., the VIV of the Great Belt East Bridge was observed at an incoming flow velocity of 4-12 m/s as presented by Larsen et al [1] and leads to structural fatigue when undergoing frequent vibration [3,4]. Therefore, it is necessary to present an efficient control scheme to suppress the amplitude of VIV [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation and Validation on Suppressing the Unsteady Aerodynamic Force and Flow Structure of Single Box Girder by Trailing Edge Jets

Chen

2022

Applied Sciences

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In the present investigation, a wind tunnel experiment was performed to evaluate the effectiveness of the trailing edge jets control scheme to mitigate the unsteady aerodynamic force and flow structure of a single box girder (SBG) model. The flow control scheme uses four isolated circular holes for forming the jet flow to modify the periodic vortex shedding behind the SBG model and then alleviate the fluctuation of the aerodynamic force acting on the test model. The Reynolds number is calculated as 2.08 × 104 based on the incoming velocity and the height of the test model. A digital pressure measurement system was utilized to obtain and record the surface pressure that was distributed around the SBG model. The surface pressure results show that the fluctuating amplitude of the aerodynamic forces was attenuated in the controlled case at a specific range of the non-dimensional jet momentum coefficient. The Strouhal number of the controlled case also deviates from that of the original SBG model. Except for the pressure measurement experiment, a high-resolution digital particle image velocimetry system was applied to investigate the detailed flow structure behind the SBG model to uncover the unsteady vortex motion process from the SBG model with and without the trailing edge jets flow control. As the jet flow blows into the wake, the alternating vortex shedding mode is switched into a symmetrical shedding mode and the width of the wake flow is narrowed. The proper orthogonal decomposition was used to identify the energy of the different modes and obtain its corresponding flow structures. Moreover, the linear stability analysis of the flow field behind the SBG model shows that the scheme of trailing edge jets can dramatically suppress the area of unsteady flow.

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Section: Piv Measurement Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Validation on Suppressing the Unsteady Aerodynamic Force and Flow Structure of Single Box Girder by Trailing Edge Jets

Chen

2022

Applied Sciences

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“…Flow control scheme of tandem cable models. Based on the passive-suction-jet control on the flow structure around a single cylinder conducted by Chen et al (2015Chen et al ( , 2019Chen et al ( , 2020, in this study, the control parameters of the passive-suction-jet pipes are set as follows. The radial thickness and height of the pipes are 0.05D and 0.8D, respectively, and 24 holes are evenly distributed on the outer surface of the pipes, as shown in Figure 3.…”

Section: Numerical Model and Validationmentioning

confidence: 99%

“…The jet flow blown out from pipes interacts with the wake flow and pushes the wake vortex structures downstream, thus transforming the wake vortex to a symmetric shedding mode. Furthermore, studies have found that a passive-suction-jet control can not only effectively manipulate the flow field around a static circular cylinder (Chen et al, 2015(Chen et al, , 2019 but also suppress its VIV response (Chen et al 2020). Previous studies proved that the passive-suction-jet pipe control method is effective in controlling the flow and vibration of a single cable segment model.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and experiment investigation on passive-suction-jet control of wind effect of two tandem cable models

Chen

Guo

Min

et al. 2020

Advances in Structural Engineering

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Two tandem cables are frequently employed as one group of hangers in a long-span suspension bridge; however, if they are close to each other, the mutual interaction between their flow fields is prone to produce large wind/wake-induced vibrations. In the present study, initially, a numerical simulation was conducted to investigate the interaction between two static tandem cable models with different spacing ratios, SR (center-to-center longitudinal spacing divided by the cable diameter, i.e. L/D). Concurrently, the passive-suction-jet control method was employed to eliminate the interaction of these two tandem cables. Aerodynamic coefficients and time-averaged and instantaneous flow fields were used to evaluate the effectiveness of the passive-suction-jet control. Subsequently, the passive-suction-jet control method was employed in a wind tunnel experiment to manipulate the wind-induced vibrations of two elastically mounted cable models. The flow patterns of the controlled tandem cables were subdivided into three basic regimes in the present study. Furthermore, the aerodynamics force suppression mechanism was explained based on the flow patterns. Both the aerodynamic forces and vibration responses of the tandem cable models reduced significantly when SR > SRc (critical spacing ratio). Particularly for SR = 4.0, the lift fluctuation reduction of both the cable models was remarkable, the fluctuating lifts of the upstream and downstream cable models decreased by 93.3% and 72.1%, respectively, and the vortex-induced vibration responses decreased by 31.4% and 54.0% respectively. Furthermore, the wake-induced vibration responses of the tandem cable models could be completely suppressed when both were controlled using passive-suction-jet pipes.

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“…They investigated the impact of various gaps between I adjacent passive jet rings for controlling the VIV. To investigate the plate length’s sensitivity Gao et al 31 provided an upstream splitter plate to the stagnation point of a circular cylinder. They concluded that the reduction in the mean drag and fluctuating lift could reach 36.0% and 63.6%, respectively, when L/D was equal to 1.0.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of splitter plate to control fluid forces on a circular obstacle in a transient flow: FEM computations

Ain

Mahmood

Awrejcewicz

et al. 2022

Sci Rep

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The reliability of the usage of a splitter plate (passive control device) downstream of the obstacle, in suppressing the fluid forces on a circular obstacle of diameter $$D = 0.1\;\;{\text{m}}$$ D = 0.1 m is studied in this paper. The first parameter of the current study is the attachment of a splitter plate of various lengths $$(L_{i} )$$ ( L i ) with the obstacle, whereas the gap separation $$(G_{i} )$$ ( G i ) between the splitter plate and the obstacle, is used as a second parameter. The control elements of the first and second parameters are varied from $$0.1$$ 0.1 to $$0.3$$ 0.3 . For the attached splitter plates of lengths $$0.2$$ 0.2 and $$0.3$$ 0.3 , the oscillatory behavior of transient flow at $$Re = 100$$ R e = 100 is successfully controlled. For the gap separation, $$0.1$$ 0.1 and $$0.2$$ 0.2 similar results are obtained. However, it is observed that a splitter plate of too short length and a plate located at the inappropriate gap from the obstacle, are worthless. A computational strategy based on the finite element method is utilized due to the complicated representative equations. For a clear physical depiction of the problem, velocity and pressure plots have been provided. Drag and lift coefficients the hydrodynamic benchmark values are also evaluated in a graphical representation surrounding the obstacle’s peripheral surface as well as the splitter plate. In a conclusion, a splitter plate can function to control fluid forces whether it is attached or detached, based on plate length and gap separation between obstacle and plate, respectively.

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Suppression of vortex-induced vibration of a circular cylinder by a passive-jet flow control

Cited by 58 publications

References 29 publications

Experimental Investigation and Validation on Suppressing the Unsteady Aerodynamic Force and Flow Structure of Single Box Girder by Trailing Edge Jets

Experimental Investigation and Validation on Suppressing the Unsteady Aerodynamic Force and Flow Structure of Single Box Girder by Trailing Edge Jets

Numerical simulation and experiment investigation on passive-suction-jet control of wind effect of two tandem cable models

Effectiveness of splitter plate to control fluid forces on a circular obstacle in a transient flow: FEM computations

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