Experimental study on transverse flow-induced oscillations of a square-section cylinder at low mass ratio and low damping

Xu-Xu, J.; Barrero-Gil, A.; Velázquez, A.

doi:10.1016/j.expthermflusci.2015.12.014

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…Wang et al (2015) investigated the effect of incidence angle on the vibration characteristics of a triangular cylinder with a two-degree-of-freedom motion and found that most of the cylinder motions exhibit a regular figure-eight trajectory. Xu-Xu et al (2016) observed that FIM of a square cylinder at low mass ratio and low damping starts at a reduced velocity, which is close to St −1 . Cui et al (2015) investigated FIM of a square cylinder and a rectangular cylinder of an aspect ratio of 0.5.…”

Section: Introductionmentioning

confidence: 63%

Flow induced motion of an elastically mounted trapezoid cylinder with different rear edges at high Reynolds numbers

Mao¹,

Zhang²,

Hu³

et al. 2019

Fluid Dyn. Res.

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The flow induced motion (FIM) of an elastically mounted trapezoid cylinder with different body shapes is numerically studied by solving two-dimensional unsteady Reynolds-averaged Navier-Stokes equations. The trapezoid cylinder is mounted on end-supporting linear springs constrained to oscillate normal to the direction of flow and the axis of cylinder. Numerical simulations were performed in Reynolds number(Re) range from 10 000 to 120 000. The ratio of the rear and front edge width of the cylinder, λ, varies from zero to one. Both vortex-induced vibrations (VIV) and galloping are observed for the cylinder in the tested cases. The VIV upper branch for trapezoid cylinder with λ=0.8 and square cylinder (λ=1) are clearly observed in the amplitude and frequency responses. Galloping are exhibited for trapezoid cylinder with different body shapes when Re90 000. The FIM responses of the square cylinder is obviously weaker than the triangle and trapezoid cylinders, since the interaction between the separated shear layers on the upper and lower sides of the cylinder becomes weak as λ increases. The maximum value of amplitude is achieved at 4.51D (D is the front edge width of the trapezoid cylinder) for λ=0.6 at U water * =22.21 (Re=120 000), where U water * =U/( f n,water D) and f n,water is the natural frequency of the oscillatory system in water. Up to 18 vortices are observed in the galloping branch. The displacement trend of the cylinder matches well with the lift forces, especially in the galloping branch.

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Section: Introductionmentioning

confidence: 63%

Flow induced motion of an elastically mounted trapezoid cylinder with different rear edges at high Reynolds numbers

Mao¹,

Zhang²,

Hu³

et al. 2019

Fluid Dyn. Res.

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“…In this way, the prism is restricted to oscillate in the direction transverse to the flow () with low mechanical damping. The experimental set-up is similar to that used in previous research by the authors (see, e.g., Xu-Xu, Barrero-Gil & Velazquez 2016; Vicente-Ludlam, Barrero-Gil & Velazquez 2018). During the experiments, the transverse displacement of the prism was measured by a non-contact laser vibrometer () from Aquity AR500-500 (range 500 mm, resolution 0.05 mm) whose DC signal was registered through a Ni-USB 6002 DAQ card from National Instruments.…”

Section: Description Of the Experimental Set-upmentioning

confidence: 99%

Influence of cross-section shape on energy harvesting from transverse flow-induced vibrations of bluff bodies

Barrero-Gil

Serruys²,

Velázquez³

2022

J. Fluid Mech.

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Hydroelastic experiments have been carried out in a free surface water channel to study the influence of the cross-section shape on the mechanical energy transfer from a uniform flow to a self-excited crossflow oscillating prism. Seventeen cross-section shapes were tested with the same mechanical properties (say, mass ratio and mechanical damping) and aspect ratio. Then, the study was focused on the role of the cross-section shape and reduced velocity on the prism dynamics and energy transfer from the fluid flow. It has been found that the geometric centroid of the semi-cross-section and the afterbody length of the cross-section represent a simple and effective metric to characterise the energy transfer. Two related dimensionless geometric parameters are introduced. The dependence of the energy transfer with these two parameters is studied and used to design successfully ‘in advance’ cross-section shapes with high energy transfer efficiencies. It has been observed from particle image velocimetry measurements that large energy transfer shapes are those in which, under strong oscillations, the flow follows the cross-section contour of one side and is fully detached on the other side.

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“…3.6 A * and f * variation with reduced velocity U * . From left to the right: Nemes et al (2012), Zhao et al (2014) and Xu-Xu et al (2016b). Open square stands for experimental results from Zhao et al (2013) in the configuration where m * = 152.6 and δ = 0.4. .…”

Section: Variation With M * + M *mentioning

confidence: 99%

“…In all cases, experiments were carried out with a elastically-mounted rigid square prism in a free-surface recirculating water channel in such a way that m * was in the range of 2.2.6: A * and f * variation with reduced velocity U * . From left to the right:Nemes et al (2012),Zhao et al (2014) andXu-Xu et al (2016b). Model prediction in solid line.…”

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confidence: 99%

Fluid-structure interaction of circular and square cylinders : dynamics and energy transfer

Xu¹

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Firstly, I would like to express my sincere gratitude to my Doctoral Thesis Director Prof. Dr. Antonio Barrero Gil for the continuous support of my PhD study and related research, for his patience, motivation, and immense knowledge. His guidance and encouragement helped me in all the time of research and writing of this Thesis, also for the hard question which incented me to widen my research from various perspectives. I could not have imagined having a better advisor and mentor for my PhD study. My sincere thanks also goes to Prof. Dr. Ángel Velázquez and Prof. Dr. Juan Ramón Arias Pérez, who provided me an opportunity to join their research team as PhD candidate, and who gave access to the laboratory and research facilities. Without their precious support it would not be possible to conduct this research. I will always be thankful to Miguel de las Heras, Ricardo de las Heras and José Sánchez for their continuous support in the laboratory, which made such outstanding experimental facilities possible. They would always surpass the desired quality of the required experimental hardware. I would also like to thank my fellow labmates, Miguel Reyes Mata and Francisco Sastre Matesanz with whom I have spent so many years and David Vicente Ludlam who was always willing to give me a hand whenever I needed. This research has been funded by the international company REPSOL S.A., through the REPSOL-INSPIRE program and under contract P120130288. Through this program I was able to personally meet great professionals and people including Bernardo del Amo Fernández and Oscar Prieto Acedo. Last but not the least, I would like to thank my family: my partner Lorenzo, my parents, Menghua and Fenfang and my brother, Roberto, for supporting me throughout this Thesis and my life in general.

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Experimental study on transverse flow-induced oscillations of a square-section cylinder at low mass ratio and low damping

Cited by 9 publications

References 22 publications

Flow induced motion of an elastically mounted trapezoid cylinder with different rear edges at high Reynolds numbers

Flow induced motion of an elastically mounted trapezoid cylinder with different rear edges at high Reynolds numbers

Influence of cross-section shape on energy harvesting from transverse flow-induced vibrations of bluff bodies

Fluid-structure interaction of circular and square cylinders : dynamics and energy transfer

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