Midﬁdelity model veriﬁcation for a point-absorbing wave energy converter with linear power take-off
In the preliminary design stage of a wave
energy converter (WEC), researchers need fast and reliable
simulation tools. High-ﬁdelity numerical models are usu-
ally 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 veriﬁed 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 dynam-
ics, whereas the linear solution could suggest misleading
Copyright (c) 2022 EIRINI KATSIDONIOTAKI, Yi-Hsiang Yu, Malin Göteman
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