Interactions of regular waves with a double, fixed, pontoon type, floating breakwater (FB) are studied numerically with the use of a 2DV Unsteady Reynolds Averaged Navier-Stokes (URANS) model. The study is focused on the effect of the structure width and spacing, both made dimensionless with the wave length (W/L and S/L), on the reflection, transmission and dissipation characteristics. The results of the numerical model are in good agreement with available large scale experimental data. Ct decreases with increasing W/L for all S/L; for a 100% increase of W/L a 62% (maximum) and a 34 % (minimum) decrease of Ct is found for S/L=0.25 and S/L=1.04 respectively . The effect of relative spacing S/L is not monotonic since Ct exhibits several maxima and minima with S/L. Better results are obtained for S/L<0.75 with Ct values less than 0.1.
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机译：用双，固定的，浮桥型浮动防波堤（FB）的常规波的相互作用是在使用2DV不稳定的雷诺平均的Navier-Stokes（urans）模型的情况下进行了数值研究。该研究专注于结构宽度和间距的效果，两者都具有在反射，传输和耗散特性上的波长（W / L和S / L）的无量纲。数值模型的结果与可用的大规模实验数据吻合良好。对于所有S / L的W / L增加，CT减小;对于100％的W / L增加，S / L = 0.25和S / L = 1.04分别发现CT的62％（最大）和34％（最小）降低。相对间隔S / L的效果不是单调的，因为CT表现出几种最大值和S / L的最大值和最小值。对于S / L <0.75的CT值小于0.1，获得了更好的结果。
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