Hydrodynamic performance of a box-type submerged floating breakwater with an overlying horizontally coupled perforated plate

초록

The hydrodynamic performance of a fully submerged box-type floating breakwater (FB) coupled with an overlying horizontal perforated plate was numerically investigated. The simulations were conducted using an FVM-VOF CFD framework with RANS turbulence modeling and a weakly coupled two-way fluid-structure interaction (FSI) scheme, enabling a detailed evaluation of the viscous dissipation mechanisms induced by plate attachment. Three configurations were compared: a baseline configuration without a plate (WOP), a configuration with a solid plate (WSP), and a configuration with a perforated plate (WPP). A parametric study of the plate position and opening ratio showed that the WPP configuration improved the breakwater performance through enhanced energy dissipation, while reducing the mooring response. The best performance was achieved at a distance ratio of 0.65 and an opening ratio of 22.5%, where the transmission coefficient reached a minimum value of 0.154, representing a 46.5% reduction relative to the baseline configuration. Additional simulations were conducted using regular waves of various periods and irregular waves (JONSWAP). These results confirm that the FB-WPP configuration maintained its performance improvement and associated mechanisms under a wider range of wave conditions.

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