Midfidelity Model Verification for a Point-Absorbing Wave Energy Converter with Linear Power Take-Off

Eirini Katsidoniotaki, Yi-Hsiang Yu, Malin Goteman

Research output: Contribution to journalArticlepeer-review


In the preliminary design stage of a wave energy converter (WEC), researchers need fast and reliable simulation tools. High-fidelity numerical models are usually employed to study the wave-structure interaction, but the computational cost is demanding. As an alternative, midfidelity models can provide simulations in the order of real time. In this study, we operate Uppsala University's WEC in a relatively mild sea state and model it using WEC-Sim. The model is verifed based on OpenFOAM simulations. To analyze the ability of the midfidelity model to capture WEC dynamics, we investigate the system separately with 1, 2, and 3 degrees of freedom. We examine the contribution of viscous phenomena, and study both linear and weakly nonlinear solutions provided by WEC-Sim. Our results indicate that the viscous effects can be neglected in heave and surge motion, but not for pitch. We also find that the weakly nonlinear WEC-Sim solution successfully agrees with the computational fluid dynamics, whereas the linear solution could suggest misleading results.
Original languageAmerican English
Pages (from-to)67-75
Number of pages9
JournalInternational Marine Energy Journal
Issue number1
StatePublished - 2022

NREL Publication Number

  • NREL/JA-5700-83489


  • CFD
  • hydrodynamic analysis
  • numerical simulations
  • offshore renewables
  • point-absorber
  • verification
  • wave energy
  • wave-structure interaction
  • WEC-Sim


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