Coupled modelling of a non-linear wave energy converter and hydraulic PTO

Caitlin Worden Hodge, Will Baterman, Zhiming Yuan, Philipp R. Thies, Tom Bruce

Research output: Contribution to conferencePaperpeer-review

1 Citation (Scopus)


The mechanical motion of a wave energy converter (WEC) is converted by the power take-off (PTO) system into electricity, but these two systems are not independent, as they have been treated in WEC modelling. Treating them as such leads to inaccuracies in prediction of power output and reliability, and can erode confidence in numerical modelling tools. This paper presents a methodology for the two-way coupling of high fidelity modelling of WEC hydrodynamics with a more accurate representation of the PTO and investigates the impact of using simplified PTO models. Simplified models represent the full PTO with a single parameter which is in itself difficult to choose and may require a number of iterations. These different methods were used to assess the behaviour of the CCell WEC in a regular wave, with the calculations for mean power varying considerably in different wave conditions and the range of motion consistently under predicted by the simpler models. The coupled model increased the computational requirement for the simulation, however it provided the developer a better understanding of the impact on and utilisation of different hydraulic components.
Original languageEnglish
Number of pages7
Publication statusPublished - 2018
EventTwenty-eighth (2018) International Ocean and Polar Engineering Conference - Sapporo, Japan
Duration: 10 Jun 201815 Jun 2018


ConferenceTwenty-eighth (2018) International Ocean and Polar Engineering Conference


  • wave energy converter
  • optimisation
  • CFD
  • hydrodynamics
  • PTO modelling

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