Topographic effects on wave resonance in the narrow gap between fixed box and vertical wall
Topographic effects on wave resonance in the narrow gap between fixed box and vertical wall
复制标题
地形对固定箱体与垂直墙窄间隙波共振的影响
DOI：
10.1016/j.oceaneng.2019.03.040
复制
发表时间：
2019-05
影响因子：
5
通讯作者：
Gang Wang
中科院分区：
文献类型：
--
作者：
Junliang Gao;Zhiwei He;Jun Zang;Qiang Chen;Haoyu Ding;Gang Wang
多个海岸和近海结构物以窄间隙并排布置时，可能会发生大幅自由表面共振，导致甲板上出现绿色水，引起结构物水动力载荷急剧增加。本文利用二维数值波浪水槽，模拟了不同波高的规则波入射时，固定箱与竖直壁之间的窄间隙内自由表面的共振运动。在垂直墙前布置不同倾角的平面斜坡地形。本文的主要重点是研究地形变化对窄缝内流体共振的影响。首次发现流体共振频率随地形坡度单调下降，共振波高放大率和反射系数均随地形坡度呈现波动规律。对于本文所考虑的所有地形，流体共振频率和共振波高放大率均随入射波高的增加而减小，而反射系数随入射波高的变化趋势取决于地形坡度。
Multiple coastal and offshore structures deployed side by side with narrow gap may be subject to large-amplitude free surface resonance, which can lead to green water on the deck and cause rapid increase of hydrodynamic loading on structures. Here, the resonant motions of the free surface inside a narrow gap between a fixed box and a vertical wall excited by incident regular waves with various wave heights are simulated using a two-dimensional numerical wave tank. The topographies of plane slopes with different inclinations are deployed in front of the vertical wall. The main focus of this paper is on the influences of the topographical variation on the fluid resonance inside the narrow gap. For the first time, it is found that the fluid resonant frequency decreases monotonously with the topographical slope, and both the amplification of the resonant wave height and the reflection coefficient present a pattern of fluctuation with the slope. For all the topographies considered in this paper, both the fluid resonant frequency and the amplification of the resonant wave height are shown to decrease with the incident wave height; while the variation trend of the reflection coefficient with the incident wave height depends on the topographical slope.
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