Abstract Wave energy, a renewable resource, is gaining attention for its abundance and high energy density. Floating oscillating water column-type wave energy converters (OWC-WECs) are important, combining the simplicity and low maintenance of OWC-WECs with the flexibility and environmental benefits of floating structures. The natural period of the water column in OWC-WECs is typically calculated based on air chamber dimensions, with more advanced estimations using an effective length parameter. However, Power take off (PTO)-damping, a key factor for power generation, is neglected. PTO-damping influences the damping ratio of water column motion and alters the resonant period at which the water column responds to waves. To develop higher-performance OWC-WECs, understanding the water column motion, including PTO damping, is crucial. Computational fluid dynamics (CFD) is effective for analyzing this motion, and while grid-based CFD has been used in OWC-WEC optimization, it must consider survivability in rough conditions and robustness against nonlinear phenomena. This study employed a moving particle simulation (MPS) method to analyze the performance of a floating OWC-WEC. The MPS method, compared to mesh-based CFD, captures free surface dynamics and handles complex fluid-solid interactions. The authors conducted a free decay test and water tank experiment for two OWC shapes—bottom and side openings—and analyzed the natural period, damping ratio, and added mass through numerical simulations.
Sasahara et al. (Sun,) studied this question.
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