An unsteady RANS simulation of the performance of an oscillating hydrofoil at a high Reynolds number

Wang, Hongliang; Zheng, Xing; Pröbsting, Stefan; Hu, Changhong; Wang, Qiang; Li, Ye

doi:10.1016/j.oceaneng.2023.114097

Cited by 8 publications

(3 citation statements)

References 43 publications

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“…The reliability of this mo confirmed in similar studies [31]. Moreover, Wang's [32] In this context, the roll angular velocity of the horizontal axis turbine is denoted as ω r (unit: rad/s), where T is the period of roll motion and A is the amplitude of roll motion. The distance in the Y direction between the roll motion axis and the water turbine axis is 0.78 m. Additionally, the tidal current turbine rotates around its own axis with an angular velocity of ω during the roll motion.…”

Section: Solver and Turbulence Model Settingssupporting

confidence: 59%

“…The reliability of this model has been confirmed in similar studies [31]. Moreover, Wang's [32] comparison of numerical simulations with experimental data demonstrated the accuracy of this turbulence model in predicting outcomes at a Reynolds number of 1.2 × 10 −5 . The Reynolds number of the model employed in this study is approximately 1 × 10 −5 , which can be determined from the equation where Re represents the Reynolds number and v denotes the kinematic viscosity of water.…”

Section: Solver and Turbulence Model Settingssupporting

confidence: 53%

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Hydrodynamics and Wake Flow Analysis of a Floating Twin-Rotor Horizontal Axis Tidal Current Turbine in Roll Motion

Zhao,

Chen,

Jiang

2023

JMSE

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The study of hydrodynamic characteristics of floating double-rotor horizontal axis tidal current turbines (FDHATTs) is of great significance for the development of tidal current energy. In this paper, the effect of roll motion on a FDHATT is investigated using the Computational Fluid Dynamics (CFD) method. The analysis was conducted in the CFD software STAR-CCM+ using the Reynolds-averaged Navier–Stokes method. The effects of different roll periods and tip speed ratios on the power coefficient and thrust coefficient of FDHATT were studied, and then the changes in the vorticity field and velocity field of the turbine wake were analyzed by two-dimensional cross-section and Q criterion. The study indicates that roll motion results in a maximum decrease of 30.76% in the average power coefficient and introduces fluctuations in the instantaneous load. Furthermore, roll motion significantly accelerates the recovery of wake velocity. Different combinations of roll periods and tip speed ratios lead to varying degrees of wake velocity recovery. In the optimal combination, at a position 12 times the rotor diameter downstream, roll motion can recover the wake velocity to 92% of the incoming flow velocity. This represents a 23% improvement compared to the case with no roll motion.

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Section: Solver and Turbulence Model Settingssupporting

confidence: 59%

Section: Solver and Turbulence Model Settingssupporting

confidence: 53%

Hydrodynamics and Wake Flow Analysis of a Floating Twin-Rotor Horizontal Axis Tidal Current Turbine in Roll Motion

Zhao,

Chen,

Jiang

2023

JMSE

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“…Zhu [13] explored the spoiler flow stability and energy harvesting performance relationship and revealed that peak efficiency always appears between 0.10 and 0.15 frequencies as oscillation frequency decreases. Wang reported a numerical effort in studying the performance of a sinusoidally oscillating hydrofoil at a high Reynolds number, addressing the limitation of existing research which has lower Reynolds numbers [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Trailing Edge Cylindrical Spoiler Structure on the Energy Harvesting Performance of the Oscillating Foil

Zhu,

Li,

Zhang

et al. 2024

Applied Sciences

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This study explores a novel flow control approach for enhancing the energy harvesting performance of an oscillating foil, which is a promising technology for harvesting renewable energy from wind and ocean currents. This approach involves placing a cylindrical spoiler structure at the trailing edge of the foil and investigating the effects of its diameter and spacing on the energy harvesting efficiency. The results show that the spoiler cylinders can significantly increase the energy harvesting efficiency of the foil by up to 19.26% compared to the case without them. The optimal configuration for the spoiler cylinders is found to be 11.0% of c in diameter, 0.5% of c in transverse spacing, and 0 in longitudinal spacing. Moreover, this flow control method is proven to be highly effective under a wide range of motion kinetic parameters. The findings of this study provide technical guidance for the design and implementation of oscillating foil energy harvesting devices, highlighting their practical engineering value.

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Numerical investigation on local resonance within an array of C-shaped cylinders in water waves

Xu,

Ning,

Chen

et al. 2024

J Hydrodyn

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An unsteady RANS simulation of the performance of an oscillating hydrofoil at a high Reynolds number

Cited by 8 publications

References 43 publications

Hydrodynamics and Wake Flow Analysis of a Floating Twin-Rotor Horizontal Axis Tidal Current Turbine in Roll Motion

Hydrodynamics and Wake Flow Analysis of a Floating Twin-Rotor Horizontal Axis Tidal Current Turbine in Roll Motion

Effect of Trailing Edge Cylindrical Spoiler Structure on the Energy Harvesting Performance of the Oscillating Foil

Numerical investigation on local resonance within an array of C-shaped cylinders in water waves

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