CFD study of the overtopping discharge of theWave Dragon wave energy converter

Eskilsson, Claes; Palm, Johannes; Kofoed, Jens Peter; Friis-Madsen, Erik

doi:10.1201/b18973-42

Cited by 19 publications

(21 citation statements)

References 1 publication

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“…Flat and round based float shapes were considered, highlighting a significant power output increase for the latter. Eskilsson et al [131] compares viscous (employing RNG − k ε turbulence model) and inviscid simulations for a full scale overtopping type device (Wave Dragon), revealing potentially misleading results when viscosity is omitted.…”

Section: Viscous Effectsmentioning

confidence: 99%

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High-fidelity numerical modelling of ocean wave energy systems: A review of computational fluid dynamics-based numerical wave tanks

Windt

Davidson

Ringwood

2018

Renewable and Sustainable Energy Reviews

174

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For the research and development (R&D) of wave energy converters (WECs), numerical wave tanks (NWTs) provide an excellent numerical tool, enabling a cost-effective testbed for WEC experimentation, analysis and optimisation. Different methods for simulating the fluid dynamics and fluid structure interaction (FSI) within the NWT have been developed over the years, with increasing levels of fidelity, and associated computational expense. In the past, the high computational requirements largely precluded Computational Fluid Dynamics (CFD) from being applied to WEC analysis. However, the continual improvement and availability of high performance computing has led to the steady increase of CFD-based NWTs (CNWT) for WEC experiments. No attempt has yet been undertaken to comprehensively review CNWT approaches for WECs. This paper fills this gap and presents a thorough review of high-fidelity numerical modelling of WECs using CNWTs. In addition to collating the published literature, this review tries to make a step towards a best practice guideline for the applications of CFD in the field of wave energy.

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Section: Viscous Effectsmentioning

confidence: 99%

“…CNWT experiments have also been applied for the assessment of more unconventional WEC devices, for example Eskilsson et al [131] investigate the overtopping discharge of the Wave Dragon and Caskey and Jeans [77] analyse the CycWEC by the means of pressure and force coefficients for its hydrofoils.…”

Section: Performancementioning

confidence: 99%

High-fidelity numerical modelling of ocean wave energy systems: A review of computational fluid dynamics-based numerical wave tanks

Windt

Davidson

Ringwood

2018

Renewable and Sustainable Energy Reviews

174

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“…The advantages of this method are cheaper and faster solution compared to experimental model [18]. It has been progressively used for investigating the hydrodynamic behaviors and structural design performance, mostly in the aspect of wave overtopping discharges [19][20][21][22][23]. The pioneer in this technique, [22] who mostly studied on the reliability of Flow-3D as a design tool by investigating an interaction between wave motion (regular and irregular waves) with several types of coastal struc-tures.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Wave Overtopping from Various Geometrical Configurations of Coastal Breakwater Ramps

Musa¹,

Ahmad²,

Mokhtar³

et al. 2018

IJET

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Breakwater is often required for erosion protection. The effectiveness of breakwater structure as a coastal defence could be determined through overtopping wave surpass onto its crest freeboard structure. The common design practice of breakwater structure is using a linear ramp configuration. There is still a limited knowledge on the contribution of various configuration ramps shape into breakwater efficiency. Thus, this study attempts to investigate a few other's configuration of ramp geometries through overtopping discharge rate performance and identified its relationships with the crest freeboard. Three configurations of ramp geometries (convex, concave and cubic) have been investigated using numerical simulation of CFD-Flow 3D software. The result indicates that, there are significant influences of ramp configuration parameters on the overtopping rate and the highest overtopping rate is contributed from cubic shape ramp geometry. It is recommended that the detail study on cubic ramp shape geometry for determining its capability in increasing overtopping rate.

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“…RANS is a complete and accurate model with respect to nonlinear phenomena but computationally very costly. For example, a simulation with a full sea state for a WEC may require as much as 150 000 CPU hours per simulation [19]. At present RANS models are therefore unsuited for the optimization of single devices, not to mention energy farms.…”

Section: Introductionmentioning

confidence: 99%

A spectral/hpelement depth-integrated model for nonlinear wave–body interaction

Bosi

Engsig-Karup

Eskilsson

et al. 2019

Computer Methods in Applied Mechanics and Engineering

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We present a depth-integrated Boussinesq model for the e cient simulation of nonlinear wave-body interaction. The model exploits a 'unified' Boussinesq framework, i.e. the fluid under the body is also treated with the depth-integrated approach. The unified Boussinesq approach was initially proposed by Jiang [26] and recently analysed by Lannes [29]. The choice of Boussinesqtype equations removes the vertical dimension of the problem, resulting in a wave-body model with adequate precision for weakly nonlinear and dispersive waves expressed in horizontal dimensions only. The framework involves the coupling of two di↵erent domains with di↵erent flow characteristics. Inside each domain, the continuous spectral/hp element method is used to solve the appropriate flow model since it allows to achieve high-order, possibly exponential, convergence for non-breaking waves. Fluxbased conditions for the domain coupling are used, following the recipes provided by the discontinuous Galerkin framework. The main contribution of this work is the inclusion of floating surface-piercing bodies in the conventional depth-integrated Boussinesq framework and the use of a spectral/hp element method for high-order accurate numerical discretization in space. The model is verified using manufactured solutions and validated against published results for wave-body interaction. The model is shown to have excellent accuracy and is relevant for applications of waves interacting with wave energy devices.

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CFD study of the overtopping discharge of theWave Dragon wave energy converter

Cited by 19 publications

References 1 publication

High-fidelity numerical modelling of ocean wave energy systems: A review of computational fluid dynamics-based numerical wave tanks

High-fidelity numerical modelling of ocean wave energy systems: A review of computational fluid dynamics-based numerical wave tanks

Investigation of Wave Overtopping from Various Geometrical Configurations of Coastal Breakwater Ramps

A spectral/hpelement depth-integrated model for nonlinear wave–body interaction

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