Harmonic Analyses of Hydrodynamic Characteristics for Gap Resonance Between Fixed Box and Vertical Wall
Harmonic Analyses of Hydrodynamic Characteristics for Gap Resonance Between Fixed Box and Vertical Wall
复制标题
固定箱体与垂直墙间隙共振水动力特性的谐波分析
DOI：
10.1007/s13344-021-0063-7
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发表时间：
2021-09
影响因子：
1.6
通讯作者：
Gang Wang
中科院分区：
文献类型：
--
作者：
Zhiwei He;Junliang Gao;Hongzhou Chen;Jun Zang;Qian Liu;Gang Wang
当两个相邻的海洋结构物之间存在狭窄的间隙时，会发生剧烈的自由表面共振，导致甲板上出现绿色水，从而使结构物承受的水动力载荷急剧增加，严重威胁到作业安全。采用基于CFD的开源软件OpenFOAM®模拟了不同波高的规则波在固定箱和垂直壁之间的狭窄间隙内引起的二维流体共振。具有各种平面坡度的地形被放置在墙的前面。重点研究了入射波高和地形坡度对间隙共振过程中各种水动力参数（包括差距内波高、垂直波浪力和作用在箱体上的水平波浪力）的非线性特性的影响。分析了在不同的入射波高和地形坡度组合下，它们的高阶分量与相应的一阶分量的比值。结果表明，对于所有三个参数，所有高阶分量的相对重要性随着入射波高的增加而逐渐增加。地形对它们的影响与参数类型和入射波高密切相关。此外，二阶间隙共振现象的发生会导致二阶波高和水平力明显大于相应的一阶分量。
Two marine structures arranged side by side with a narrow gap may suffer from violent free-surface resonance, which would cause green water on deck, dramatically raise hydrodynamic loads on structures and seriously threaten the operation safety. The CFD-based open-sourced software, OpenFOAM®, is employed to simulate the two-dimensional fluid resonance inside a narrow gap between a fixed box and a vertical wall induced by regular waves with different wave heights. The topographies with various plane slopes are placed in front of the wall. The focus of this article is on the influences of the incident wave height and the topographic slope on the nonlinear characteristics of various hydrodynamic parameters (including the wave height in the gap, the vertical wave force, and the horizontal wave force on the box) during gap resonance. The ratios of their high-order to the corresponding 1st-order components under different sets of the incident wave height and the topographic slope are analyzed. It is found that the relative importance of all the high-order components increases gradually with the incident wave height for all the three parameters. The topographic influence on them closely depends on the type of the parameters and the incident wave height. In addition, the occurrence of the 2nd-order gap resonance phenomenon can cause the 2nd-order wave height and horizontal force to be significantly larger than the corresponding 1st-order components.
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