Numerical predictions of vibration responses and flow energy conversion efficiency of side-by-side cylinders at moderate Reynolds number

Irawan, Yosua Heru; Raza, Syed Ahmad; Chern, Ming‐Jyh

doi:10.1016/j.apor.2022.103392

Cited by 5 publications

(2 citation statements)

References 50 publications

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“…In which, i and j are the coordinate directions (i, j∈ [1,2,3]), and 𝑢 , 𝑢 and 𝑢 represent instantaneous velocity components, fluctuate velocity components, and time-averaged velocity components, respectively. 𝑝̅ is the time-averaged pressure, and ρ is the fluid density.…”

Section: Governing Equationsmentioning

confidence: 99%

“…The vibration of the structure will in turn affect the shedding vortices. 2,3 More intense motion phenomena will occur when the vortex-shedding frequency is close to the natural frequency of the marine structures, called "lock-in". 4 Therefore, VIV is an important reason for the fatigue damage or the fracture of marine structures with large slenderness ratios.…”

Section: Introductionmentioning

confidence: 99%

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Vortex Induced Vibration Response of the Cylinder Inspired by Terebridae with Different Helical Angle

Yu,

Mao,

Tian

et al. 2024

Preprint

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Biomimetic design has recently received widespread attention. Inspired by the Terebridae structure, this paper provides a structural form for suppressing vortex-induced vibration (VIV) response. Four different structural forms are shown, including the traditional smooth cylinder (P0), the Terebridae-inspired cylinder with a helical angle of 30° (P30), the Terebridae-inspired cylinder with a helical angle of 60° (P60), and the Terebridae-inspired cylinder with a helical angle of 90° (P90). And computational fluid dynamics (CFD) method is adopted to solve the flow pass the Terebridae-inspired structures, and the vibration equation is solved using the Newmark-β method. The results show that the VIV responses are effectively controlled in the lock-in region for P30, P60, and P90, and P60 shows the best VIV suppression performance. The transverse amplitude and the downstream amplitude can be reduced by 82.67% and 91.43% respectively for P60 compared with that for P0, and the peak of the mean-drag coefficient is suppressed by 53.33%. The Q-criterion vortices of P30, P60, and P90 are destroyed, with irregular vortices shedding. It is also found that the boundary layer separation is located on the Terebridae-inspired ribs. The twisted ribs cause the separation point to constantly change along the spanwise direction, resulting in the development of the boundary layer separation being completely destroyed. The strength of the wake flow is significantly weakened for the Terebridae-inspired cylinder. In the lock-in region, the motion trajectory presents a typical 8-shaped for P0, while the motion trajectory of the Terebridae-inspired cylinder tends to be a flat 1-shaped.

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Section: Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vortex Induced Vibration Response of the Cylinder Inspired by Terebridae with Different Helical Angle

Yu,

Mao,

Tian

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

Three-dimensional numerical analysis of a vertical axis autorotation current turbine (VAACT): Effects of lateral blockage and free surface

Wu,

Yang,

Wang

et al. 2024

Applied Ocean Research

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Vortex-induced vibration of two circular cylinders in a side-by-side arrangement at moderate Reynolds number: A numerical study

Irawan

Raza

2023

Physics of Fluids

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Vortex-induced vibration (VIV) of two transversely vibrating cylinders in a side-by-side (SBS) arrangement is numerically investigated using a combination of direct-forcing immersed boundary and large eddy simulation techniques. The VIV responses of vibrating SBS cylinders at two reduced velocities (UR* = 4.0 and 6.0) are studied for a range of gap ratio 1.0 ≤g*≤ 3.0. Moreover, the influence of mass ratio, damping ratio, and Reynolds number in the amplitude response and efficiency of VIVACE (Vortex-Induced Vibration for Aquatic Clean Energy) from vibrating SBS cylinders are investigated at moderate Reynolds numbers (Re = 1000 and 10 000). The optimal gap ratio for UR* = 4.0 is in the range of 1.0 ≤g*≤ 1.2. Larger than this range, the VIV responses are close to single-cylinder responses. At UR* = 6.0, all gap ratios show lower responses than a single-cylinder case. The vibrating SBS cylinder with a larger damping ratio results in higher maximum VIVACE efficiency with a narrower UR* range for significant efficiency. With almost the same amplitude response, the SBS cylinders with a lower mass ratio result in lower VIVACE efficiency. Using the same mass-damping parameters, it appears that a low mass ratio could be desirable to increase the UR* range of significant VIVACE efficiency and pick the proper damping ratio to reach a high value of maximum VIVACE efficiency. The effect of flow conditions on the amplitude response and VIVACE efficiency of vibrating SBS cylinders with the same VIV parameters is not significant.

show abstract

Numerical predictions of vibration responses and flow energy conversion efficiency of side-by-side cylinders at moderate Reynolds number

Cited by 5 publications

References 50 publications

Vortex Induced Vibration Response of the Cylinder Inspired by Terebridae with Different Helical Angle

Vortex Induced Vibration Response of the Cylinder Inspired by Terebridae with Different Helical Angle

Three-dimensional numerical analysis of a vertical axis autorotation current turbine (VAACT): Effects of lateral blockage and free surface

Vortex-induced vibration of two circular cylinders in a side-by-side arrangement at moderate Reynolds number: A numerical study

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