CFD simulation of a Passively Controlled Point Absorber Wave Energy Converter
Paper in proceedings, 2018

Recently CorPower Ocean AB presented laboratory tests of a point absorber wave energy converter equipped with a novel technique for passive phase con- trol. The technique, known as WaveSpring, widens the response bandwidth by a negative spring arrangement, and in the tank experiment an up to three-fold in- crease in delivered power as compared to pure linear damping was observed. As previously reported, for point absorbers close to resonance the use of standard radiation-diffraction models can become unreliable while CFD simulations ac- curately captures the nonlinear wave height dependent response. Thus, in the present study a module representing the WaveSpring technology was implanted in the OpenFOAM framework and CFD simulations of the buoy were per- formed both with and without the WaveSpring module. Good agreement be- tween simulated and experimental results was observed, and the WaveSpring behavior was well captured in the numerical simulation. The CFD model can be used for further tuning of the WaveSpring/buoy design as well as providing val- idation data for radiation-diffraction models.

Passive control

Nonlinear response


Wave Energy

Point Absorber


Minghao Wu

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Weizhi Wang

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Johannes Palm

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Claes Eskilsson

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Trends and Challenges in Maritime Energy Management

Malmö, Sweden,

Including Nonlinear and Viscous Effects when Modelling the Performance of Wave Energy Converters

Swedish Energy Agency, 2015-08-01 -- 2017-02-28.

Driving Forces

Sustainable development

Areas of Advance



C3SE (Chalmers Centre for Computational Science and Engineering)

Subject Categories

Marine Engineering



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