Abstract
This paper is presented to develop the hydrodynamic performance of double-row floating breakwater (FBW) by changing cross-sectional geometry in the high wave periods. The ANSYS-AQWA software is employed for the present calculations, which is a potential-based boundary element method (BEM). The rectangular moored pontoons in the single- and double-row types are selected, and the results of the wave transmission coefficient and response amplitude operator (RAO) are presented and compared. The numerical results showed good agreement with experimental data at different wavelengths, wave height, and the distance between double-row FBWs. Then, the performance results of FBWs for five shapes (rectangular, π-shaped, plus-shaped, triangular-shaped, and box-shaped) in the wave transmission coefficient, RAO, and mooring line tension are presented and compared to each other. The results showed that the plus-shaped FBW has a better performance in reducing wave transmission than other shapes. In waves with long periods, the performance of π-shaped, triangular-shaped, and box-shaped FBWs is reduced, and the rectangular FBW loses its efficiency. Overall, the plus-shaped FBW has preferable performance regarding RAO response, mooring tension, and wave transmission.
Highlights
Breakwaters are structures that are designed to protect coastal installations from the danger of waves and their impact. ere are two types of breakwaters: floating and fixed
Five different shapes of the double-row floating breakwaters (FBWs) are selected for checking the hydrodynamic performance in the wave transmission, as well as Response amplitude operator (RAO) of the three motions in the time and frequency domains. e shapes of FBWs were chosen based on the rectangular shape
The numerical results of wave transmission coefficient and RAO responses were compared with experimental data. en, five shapes of FBWs were selected to analyze the wave transmission coefficient, RAO, and mooring line tension
Summary
Breakwaters are structures that are designed to protect coastal installations from the danger of waves and their impact. ere are two types of breakwaters: floating and fixed. Pena et al experimented with several models to calculate wave transmission coefficients and concluded that the width of the pontoon is a useful parameter to determine the breakwater performance [6]. He et al introduced a type of FBW with pneumatic chambers. In an experimental study, analyzed the hydrodynamic behaviors of double-row rectangular pontoon FBW and concluded that double-row FBWs significantly reduce the transmission coefficients [25]. Is study intends to investigate the hydrodynamic performance of double-row moored FBWs with different shapes at low wave periods compared with high wave periods using a numerical model.
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