Abstract
This study aims to propose an optimal horizontal eccentric cylinder-type wave energy converter (WEC) prototype suitable for western sea of Jeju island by using linear inviscid and nonlinear viscous numerical model, appropriately. Parametric studies with respect to draft and position of center of rotation of horizontal eccentric cylinder-type WEC were carried out through a frequency domain analysis based on the linear potential theory to propose an optimal design of WEC. Dynamic behaviors of the optimized WEC in 1/20 scale induced by regular waves with different wave heights was not only experimentally investigated but also compared with a numerical result with OpenFOAM, one of computational fluid dynamic models. A response amplitude operator (RAO) induced by a higher wave height is smaller than RAO induced by a lower wave height. A non-linear dynamic behavior is investigated from spectrum analysis. A free decay test with different initial pitch excursions shows that nonlinear effects due to viscosity. The extracted power of the optimized WEC in full scale can be estimated from the simulation of full scale model induced by the wave climate in western sea of Jeju island.
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