Numerical investigation of the interaction between an inverse T-type fixed/floating breakwater and regular/irregular waves
Numerical investigation of the interaction between an inverse T-type fixed/floating breakwater and regular/irregular waves
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DOI：
10.1016/j.oceaneng.2017.03.058
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发表时间：
2017-06
影响因子：
5
通讯作者：
J. Zhan;Xue-bin Chen;Ye-jun Gong;Huai Wenqing
中科院分区：
文献类型：
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作者：
J. Zhan;Xue-bin Chen;Ye-jun Gong;Huai Wenqing
采用分区混合RANS/层流方法，对规则波和不规则波作用下的反T型自由面防波堤进行了数值分析。该方法基于改进的网格更新策略，将整个计算区域划分为若干个区域，避免了网格大范围移动造成的网格质量下降。每个网格区域指定有不同的运动自由度。在静止区，流动受物体运动的影响较小，流动被假定为层流，以避免波传播过程中的能量损失。RANS湍流模型仅适用于以指定运动分量（摇摆/起伏/俯仰）移动的移动区域。通过与周期TW = 1.0 s，振幅A= 0.0192 m的规则波下的实验数据对比，验证了分区混合RANS/层流方法的有效性。模拟的浮式防波堤运动响应，特别是横荡运动幅值，与试验测量结果吻合较好。进一步研究了规则波和不规则波作用下固浮式反T型防波堤的运动响应和消能性能。
This paper presents a numerical analysis of nonlinear interaction between inverse T-type free surface breakwater and regular/irregular waves using a zonal hybrid RANS/laminar method based on an improved mesh updating strategy, which divides the whole computation domain into several parts to avoid low quality mesh elements caused by the large-scale movement. Each mesh zone is specified with different degrees of motion freedom. In the stationary zone where the flow is less influenced by the body motion, the flow is assumed to be laminar to avoid energy loss during the wave propagation. The RANS turbulence model applies only to the moving zones that move with specified motion components (sway/heave/pitch). The zonal hybrid RANS/laminar method is validated by comparison with the experimental data measured under a regular wave with period T w= 1.0 s and amplitude A= 0.0192 m. The simulated motion responses, especially the sway motion amplitudes, of the floating breakwater are agree well with the experimental measurements. The motion responses and the energy-dissipating performances of the fixed/floating inverse T-type-type breakwater under regular/irregular waves are further investigated.