抑制环绕圆柱阵列的二次谐波诱导波近纡回效应

IF 4.3 2区 工程技术 Q1 ENGINEERING, OCEAN
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引用次数: 0

摘要

近捕现象是多柱结构在水波中的一种基本共振现象,在多柱围成的区域内会出现高波剖面。为保证工程安全,本研究提出了一种直接的方案,通过允许多柱相对于对称轴纵向移动来抑制近捕现象。为了评估该方案的有效性,我们开发并采用了一个稳定高效的时域二阶数值模型,该模型对于模拟几何形状复杂且发生单独运动的多结构也具有很强的鲁棒性。由于同时求解了一阶和二阶边界值问题,二阶非线性特性得到了强调,而二次谐波诱发的近捕迹是本研究的重点。对于本研究中的案例,经过验证的数值模型得出的数值结果证实,该方案可将波浪抬升的最大二次谐波降低 63%,将第二次近捕频率下的最大二阶波浪抬升降低 59%。一阶波的抬升也有所降低,在大部分封闭区域甚至小于入射波。由于在模拟车身响应时考虑了质量弹簧系统,通过测试不同的车身质量和刚度,可以发现波浪剖面对这些参数并不敏感,而且所有测试参数都会导致波浪剖面减小。值得注意的是,在抑制情况下,近捕获频率可能会发生偏移,而在偏移的近捕获频率上,仍然可以观察到二阶波升高的显著降低(32%)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Suppression of the second harmonic induced wave near-trapping around a cylinder array

Near-trapping is an essential resonant phenomenon associated with multiple-column structures in water waves, which exhibits high wave profiles in the area enclosed by multiple columns. For engineering safety, a straightforward scenario is proposed in this study to suppress the near-trapping phenomenon by allowing the multiple columns to move longitudinally with respect to the symmetric axes. To evaluate the effectiveness of the scenario, a stable and efficient second-order numerical model in the time domain is developed and adopted, which is also robust for the simulation of multiple structures with complex geometry and undergoing individual motions. Since both the first-order and second-order boundary value problems are solved, the second-order nonlinear properties are highlighted and the second harmonic induced near-trapping is the main focus of this study. For the cases in this study, the numerical results obtained by the validated numerical model confirm that this scenario can reduce the maximum second harmonic of the wave elevation by 63% and the maximum second-order wave elevation by 59% at the second near-trapping frequency. The first-order wave elevation is also reduced, and it is even smaller than the incident wave in a large portion of the enclosed region. As a mass–spring system is considered in the simulation of body responses, by testing different body masses and stiffnesses, it is revealed that the wave profile is insensitive to those parameters and the reduction in the wave profile occurs for all those parameters tested. It is interesting to find out that the near-trapping frequency can shift in the suppression scenario, and a remarkable reduction (32%) in the second-order wave elevation is still observed at the shifted near-trapping frequency.

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来源期刊
Applied Ocean Research
Applied Ocean Research 地学-工程:大洋
CiteScore
8.70
自引率
7.00%
发文量
316
审稿时长
59 days
期刊介绍: The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.
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