Numerical Models of a Floating Hinged Raft Wave Energy Converter

Numerical Models of a Floating Hinged Raft Wave Energy Converter

Siya Jin, Deborah Greaves, Martyn Hann, University of Plymouth

This research aims at building proper numerical models for a floating hingedraft wave energy converter (WEC) to estimate its dynamic responses. Two methods are used:

(1) a fully non-linear CFD model based on ANSYS/LS-DYNA;

(2) a linear/ partial non-linear time-domain model based on WEC-Sim.

The CFD model is firstly validated by comparing with the experimental data for a fixed raft. The numerical results fit well with the experimental data. A floating hinged WEC is then built in the CFD tank. The performance of the WEC is well predicted by CFD method and the pitch resonance is well captured. The results are compared with the linear results derived by engineers from MaRINET2. As expected, the WEC response is over-predicted by linear method. This concludes the importance in future work to carefully take consideration of the non-linear terms in models by WEC-Sim.