Oscillating water column (OWC) breakwaters have become promising in recent years for their wave energy conversion and wave protection functions. However, the changes in structural hydrodynamic performance induced by the multi-chamber design still require further in-depth investigation. In this study, a two-dimensional numerical wave tank based on the Smoothed Particle Hydrodynamics (SPH) method is first established and validated using a box-type floating breakwater case and a fixed OWC simulation. Subsequently, three OWC structures with varying chamber numbers are simulated under seven incident wave periods. The effects of chamber number on hydrodynamic performance, including wave transmission coefficient and three-degree-of-freedom motion responses, are analyzed. Results show that in low periods, the single-chamber structure exhibits the lowest transmission coefficient, the two-chamber the highest, and the three-chamber intermediate. Motion responses generally show a monotonic upward trend with increasing period, but sway and pitch reach peaks under medium wave periods in some cases.
He et al. (Tue,) studied this question.
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