Analysis of wave resonance in gap between two heaving barges

Li, Yajie; Zhang, Chongwei

doi:10.1016/j.oceaneng.2016.03.042

Cited by 49 publications

(16 citation statements)

References 11 publications

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“…However, most research to date has studied the wave resonance in the narrow gap between two fixed bodies with symmetric bottoms, between a fixed box and a vertical wall, or between moving bodies without a PTO system, which are different with the cases with dual-floater hybrid systems. Li & Zhang [22] built a numerical wave tank based on the fully-nonlinear potential-flow theory to study the effects of the distance and draft on wave resonance of the gap liquid between two heaving barges. The results showed that the relative barge draft had a strong effect on resonance frequencies, and the relative breadth of two barges affected RAOs at resonance evidently.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic performance of a dual-floater hybrid system combining a floating breakwater and an oscillating-buoy type wave energy converter

et al. 2020

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The high power generation cost impedes commercial-scale wave power operations. The main objective of this work was to provide a cost-sharing solution through combing the wave extraction and costal protection performance. A two-dimensional numerical wave tank was developed using Star-CCM+ Computational Fluid Dynamics software to investigate the hydrodynamic performance of a dual floater hybrid system consisting of a floating breakwater and an oscillating-buoy type wave energy converter (WEC). The new model was verified with published experimental results. The differences between the hydrodynamic performance of the hybrid system, a single WEC and a single breakwater were compared. The effects of the wave resonance in the WEC-breakwater gap and the geometrical parameters on the performance of the asymmetric WEC were also studied. It was found that the hybrid system demonstrated both better wave attenuation and wave energy extraction capabilities at low wave frequencies, i.e., wider effective frequency. The forces on the breakwater were generally reduced due to the WEC. Wave resonance in the narrow gap has an adverse effect on the hybrid system with an asymmetric WEC, while a beneficial effect with a symmetric WEC. The wave energy conversion efficiency of hybrid system can be improved by increasing the draft and width of the WEC and decreasing the distance between the WEC and the breakwater. The findings of this paper make wave energy economically competitive and commercial-scale wave power operations possible.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic performance of a dual-floater hybrid system combining a floating breakwater and an oscillating-buoy type wave energy converter

et al. 2020

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“…Subsequently, to better understand gap resonance and to validate the theoretical analyses, a large number of physical model tests in 2D and 3D wave basins were also implemented by previous researchers (e.g., Iwata et al (2007); Saitoh et al (2006); Zhao et al (2017)). The numerical investigations conducted so far are mainly based on the classical potential flow model employing the boundary element method and scaled boundary finite element method (e.g., Li et al (2005); Li and Zhang (2016); Sun et al (2010)).…”

Section: Introductionmentioning

confidence: 99%

On hydrodynamic characteristics of gap resonance between two fixed bodies in close proximity

et al. 2019

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The resonant water motion inside a narrow gap between two identical fixed boxes that are in side-by-side configuration is investigated using a two-dimensional (2D) numerical wave tank based on OpenFOAM ® , an open source CFD package. Gap resonance is excited by regular waves with various wave heights, ranging from linear waves to strong nonlinear waves. This paper mainly focuses on the harmonic analyses of the free-surface elevation in the narrow gap and wave loads (including the horizontal wave forces, the vertical wave forces and the moments) on the bodies. It is found that the influences of the incident wave height on the higher-order harmonic components of different physical quantities are quite different. The effects of the incident wave height on the reflection, transmission and energy loss coefficients are also discussed. Finally, aiming at the quantitative estimation of the response time and the damping time of gap resonance, two different methods are proposed and verified for the first time on gap resonance.

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“…In attempt to address the discrepancy between the model tests and linear predictions, Feng and Bai (2015), Li and Zhang (2016) developed time-domain fully nonlinear potential flow models to investigate the diffraction and radiation problems for gap resonance respectively. In Feng and Bai (2015), it was reported that the free surface nonlinearity does not account for the over-estimation of resonant responses.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of viscous effects on the gap resonance between side-by-side barges

et al. 2017

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This paper presents a numerical study of the gap resonance between two side-by-side barges by using a multiphase Navier-Stokes equations model. In order to verify the multiphase flow model, it is firstly applied to simulate a two-dimensional gap resonance problem for two fixed boxes under various wave conditions. A comparison of the free surface elevations obtained on successively refined grids confirms the mesh convergence of numerical solutions. The calculated wave elevation response amplitude operators (RAOs) in the gap compare well with the experimental measurements. The multiphase flow model is further extended to calculate a three-dimensional gap resonance problem for two adjacent rectangular barges. The computed free surface RAOs in the gap also agree well with the experimental results. A close examination of the flow velocity and vorticity in the gap region at the piston resonant mode reveals that large amount of vortices are generated by the sharp corners of the two barges and shed downwards, which provide an effective mechanism to dissipate the flow kinematic energy and to reduce the wave elevation in the gap. On the contrary, rounded corners are not able to induce the same level amount of vortices to dampen the gap resonance. The effects of incident wave steepness on the viscous damping associated with the twin-barge system are highlighted.

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Analysis of wave resonance in gap between two heaving barges

Cited by 49 publications

References 11 publications

Hydrodynamic performance of a dual-floater hybrid system combining a floating breakwater and an oscillating-buoy type wave energy converter

Hydrodynamic performance of a dual-floater hybrid system combining a floating breakwater and an oscillating-buoy type wave energy converter

On hydrodynamic characteristics of gap resonance between two fixed bodies in close proximity

Numerical investigation of viscous effects on the gap resonance between side-by-side barges

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