Validation of simulated wave energy converter responses to focused waves

Rij, Jennifer van; Yu, Yi Hsiang; Tran, Thanh Toan

doi:10.1680/jencm.19.00039

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…In the NewWave Theory approach, the average shape of the highest wave with a specified exceedance probability is produced for a given sea state [26]. The theory has been used extensively to study WEC behaviour in equivalent extreme waves both numerically and experimentally, see, e.g., [5,6,11,14,16,27]. In Table 4, the equivalent focused wave profiles can be found.…”

Section: Equivalent Regular Wavesmentioning

confidence: 99%

“…When comparing the CFD models for the regular and focused waves, they found that the former showed up to 34% difference from the experimental design load response, whereas the latter produced a result within 17% of the experimental data. In [14], a WEC-Sim model was compared with a STAR-CCM+ CFD model for a focused wave obtained using NewWave theory, and the overall responses predicted by the two models compared well, and were on average within 5% from each other. This is in contrast to the results of [18], where the dynamics predicted by a high-fidelity CFD method gave a better agreement with experimental data than linear-based models.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, methods to study the WEC in equivalent design waves have been developed in recent years. Presently, both regular and focused waves are commonly used as design waves [3,4,[11][12][13][14], but the reliability of the methods for predicting extreme loads is still an open question, along with how the different methods compare. This is the topic of the current paper.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Loads on a Point Absorber Wave Energy Converter in Regular and Focused Extreme Wave Events

Katsidoniotaki¹,

Ransley²,

Brown³

et al. 2021

Preprint

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Accurate modeling and prediction of extreme loads for survivability is of crucial importance if wave energy is to become commercially viable. The fundamental differences in scale and dynamics from traditional offshore structures, as well as the fact that wave energy has not converged around one or a few technologies, implies that it is still an open question how the extreme loads should be modeled. In recent years, several methods to model wave energy converters in extreme waves have been developed, but it is not yet clear how the different methods compare. The purpose of this work is the comparison of two widely used approaches when studying the response of a point-absorber wave energy converter in extreme waves, using the open-source CFD software OpenFOAM. The equivalent design-waves are generated both as equivalent regular waves and as focused waves defined using NewWave theory. Our results show that the different extreme wave modeling methods produce different dynamics and extreme forces acting on the system. It is concluded that for the investigation of point-absorber response in extreme wave conditions, the wave train dynamics and the motion history of the buoy are of high importance for the resulting buoy response and mooring forces.

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Section: Equivalent Regular Wavesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Loads on a Point Absorber Wave Energy Converter in Regular and Focused Extreme Wave Events

Katsidoniotaki¹,

Ransley²,

Brown³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…For a deeper analysis in extreme wave conditions, high-fidelity computational fluid dynamics (CFD) codes are widely employed to provide accurate evaluation of the dynamics of WEC mechanisms by capturing viscous effects, wave breaking, slamming, overtopping, and large amplitude motions. The most widely used CFD-based approach is the incompressible two-phase Reynolds averaged Navier-Stokes simulations [8], implemented in several recent studies [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Digital Twin for the Prediction of Extreme Loads on a Wave Energy Conversion System

2022

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Wave energy is a renewable energy source with the potential to contribute to the global electricity demand, but a remaining challenge is the survivability of the wave energy converters in harsh offshore conditions. To understand the system dynamics and improve the reliability, experimental and numerical studies are usually conducted. However, these processes are costly and time-consuming. A statistical model able to provide equivalent results is a promising approach. In this study, the digital twin of the CFD solution is developed and implemented for the prediction of the force in the mooring system of a point-absorber wave energy converter during extreme wave conditions. The results show that the digital twin can predict the mooring force with 90.36% average accuracy. Moreover, the digital twin needs only a few seconds to provide the solution, while the CFD code requires up to several days. By creating a digital analog of a wave energy converter and showing that it is able to predict the load in critical components during extreme wave conditions, this work constitutes an innovative approach in the wave energy field.

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“…In addition, a weakly nonlinear formulation is often used to account for the nonlinear buoyancy and Froude-Krylov forces, induced by the instantaneous free surface elevation and body position. As presented in [12], [13] WEC-Sim was applied in a study as part of the Collaborative Computational Project in Wave Structure Interaction 2 (CCP-WSI) Blind Test Series 2 for a hemisphericalbottomed cylinder and a truncated cylinder with a cylindrical moon pool under series of focused waves.…”

mentioning

confidence: 99%

Midﬁdelity model veriﬁcation for a point-absorbing wave energy converter with linear power take-off

Katsidoniotaki

Yu²,

Göteman³

2022

Int. J. Mar. Ene.

Self Cite

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In the preliminary design stage of a waveenergy converter (WEC), researchers need fast and reliablesimulation tools. High-ﬁdelity numerical models are usu-ally employed to study the wave-structure interaction, butthe computational cost is demanding. As an alternative,midﬁdelity models can provide simulations in the order ofreal time. In this study, we operate Uppsala University’sWEC in a relatively mild sea state and model it usingWEC-Sim. The model is veriﬁed based on OpenFOAMsimulations. To analyze the ability of the midﬁdelitymodel to capture WEC dynamics, we investigate the systemseparately with 1, 2, and 3 degrees of freedom. We examinethe contribution of viscous phenomena, and study bothlinear and weakly nonlinear solutions provided by WEC-Sim. Our results indicate that the viscous effects can beneglected in heave and surge motion, but not for pitch.We also ﬁnd that the weakly nonlinear WEC-Sim solutionsuccessfully agrees with the computational ﬂuid dynam-ics, whereas the linear solution could suggest misleadingresults.

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Validation of simulated wave energy converter responses to focused waves

Abstract: Cite this article van Rij J, Yu YH and Tran TT (2021) Validation of simulated wave energy converter responses to focused waves.

Cited by 5 publications

References 14 publications

Loads on a Point Absorber Wave Energy Converter in Regular and Focused Extreme Wave Events

Loads on a Point Absorber Wave Energy Converter in Regular and Focused Extreme Wave Events

Digital Twin for the Prediction of Extreme Loads on a Wave Energy Conversion System

Midﬁdelity model veriﬁcation for a point-absorbing wave energy converter with linear power take-off

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