Innovative Floating Polygonal Ring Breakwaters with Wide Porous Media for Sheltered Basin in Offshore Waters

Engineering ›› DOI: 10.1016/j.eng.2025.08.011

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Abstract

Hydrodynamic solutions for floating polygonal ring breakwaters with wide porous media on their inner and outer edges have been obtained using a semi-analytical formulation. Square, pentagonal, hexagonal, and circular breakwater shapes can be readily generated using a cosine-type radial perturbation. The analytical formulation and the developed computer code were verified in two steps: ① verification using ANSYS AQWA (ANSYS Inc., USA) for limiting cases without porous media and ② verification using two independent methods that account for the effect of porous media. After verifying the computer code, parametric studies were conducted to investigate the effect of wide porous media on the hydrodynamic performance of the floating polygonal ring breakwaters. In general, resonance occurs due to trapped waves inside the floating ring breakwater. However, the adoption of wide porous media on the outer and inner edges of the ring breakwater significantly reduces this resonant phenomenon, as evidenced by reductions in wave exciting forces, added masses, radiation damping, and response amplitude operators (RAOs). Furthermore, the wave fields generated inside and outside the floating polygonal ring breakwaters were calmer due to the suppression of strong reflected waves on the outside and resonant waves on the inside. Forces in the taut mooring lines were also evaluated to examine the effect of wide porous media in reducing large resonant mooring forces. The forces showed substantial improvements in mooring system performance. Overall, the proposed novel concept of using wide porous media along the outer and inner edges of offshore ring breakwaters offers a promising solution for creating sheltered basins that minimize the occurrence of resonant wave phenomena. Moreover, the present semi-analytical method can serve as a benchmark for validating other numerical approaches and computer codes in studying the hydrodynamic responses of floating polygonal ring breakwaters.

Keywords

Semi-analytical method / Wide porous media / Floating polygonal ring breakwater / Resonance / Taut mooring system / Eigenfunction expansion method

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Jeong Cheol Park, Chien Ming Wang, Kyu Han Kim. Innovative Floating Polygonal Ring Breakwaters with Wide Porous Media for Sheltered Basin in Offshore Waters. Engineering DOI:10.1016/j.eng.2025.08.011

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