Modelling of the WITT wave energy converter

Sarah Crowley, Richard Porter*, Dominic Taunton, Philip Wilson

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

28 Citations (Scopus)
282 Downloads (Pure)


The paper describes the theoretical modelling and experimental validation of a novel design of ocean wave energy converter which is comprised of a floating, moored, spherical hull containing a mechanical pendulum arrangement from which power is taken when excited by incident waves. Experimental results are shown to compare favourably with those predicted by the theory. An explicit expression is derived for the capture width of the proposed device in terms of physical and hydrodynamic parameters. This exposes the multiple resonant characteristics of the device which enable it to operate effectively over a broad range of wave periods. The subsequent efficient computations allows a numerical optimisation of the design to be performed over a large space of device parameters and model sea spectrum. The work is focussed towards producing reliable estimates for the power capacity of different sized devices deployed at the EMEC site in Scotland. Predictions compare favourably with existing wave energy converter concepts.
Original languageEnglish
Pages (from-to)159-174
Number of pages16
JournalRenewable Energy
Early online date7 Aug 2017
Publication statusPublished - 1 Jan 2018


  • Wave energy converter
  • Floating sphere
  • Internal pendulum
  • Coupled resonances


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