Investigations on Fluid Resonance Within A Narrow Gap Formed by Two Fixed Bodies with Varying Breadth Ratios
Investigations on Fluid Resonance Within A Narrow Gap Formed by Two Fixed Bodies with Varying Breadth Ratios
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DOI：
10.1007/s13344-023-0080-9
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发表时间：
2023-12
影响因子：
1.6
通讯作者：
Shu-kai Gong;Jun-liang Gao;Hong-fei Mao
中科院分区：
文献类型：
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作者：
Shu-kai Gong;Jun-liang Gao;Hong-fei Mao
采用基于开源CFD软件OpenFOAM的二维数值波浪水槽，研究了不同波高的规则波入射引起的两个固定箱体之间狭窄间隙内流体的共振运动。这两个箱具有相同的吃水深度和高度，但上游箱具有可变的宽度。本文重点研究宽度比（定义为上游箱体宽度与下游箱体宽度之比）对间隙共振水动力特性的以下三个方面的影响：（1）差距内、结构系统前后的波高放大系数;（2）结构系统的反射系数、透射系数和能量损失系数;（3）流体共振的响应时间和阻尼时间。结果表明，随着宽比的增大，流体共振频率、差距内共振波高放大系数和结构系统的最大能量损失系数均逐渐减小。结果表明，无论入射波高如何，间隙共振的响应时间总体上随宽度比的增大先增大后减小，且两箱体宽度相同时，间隙共振的响应时间最大。
The resonant motion of the fluid inside a narrow gap between two fixed boxes induced by incident regular waves with various wave heights is investigated by adopting a two-dimensional numerical wave flume based on an open-sourced CFD package, OpenFOAM. The two boxes have identical draft and height, but the upstream box has a variable breadth. This article focuses on the influences of the breadth ratio, defined as the ratio of the breadth of the upstream box to that of the downstream box, on the following three aspects of hydrodynamic characteristics of gap resonance: (1) the wave height amplifications inside the gap, and in front and at the rear of the structure system, (2) the reflection, transmission, and energy loss coefficients of the structure system, and (3) the response and damping time of the fluid resonance. It is found that the fluid resonant frequency, the amplification factor of the resonant wave height inside the gap and the maximum energy loss coefficient of the structure system are shown to gradually decrease with the increase of the breadth ratio. The response time of gap resonance is shown to first increase and then decrease with the breadth ratio overall, regardless of the incident wave height, and the configuration that the two boxes have the same breadth would bring the largest response time of gap resonance.