Fluid resonance in the narrow gap of a box-wall system under cnoidal wave action
Fluid resonance in the narrow gap of a box-wall system under cnoidal wave action
复制标题
椭圆形波作用下箱壁系统窄间隙中的流体共振
DOI：
10.1016/j.oceaneng.2021.109774
复制
发表时间：
2021
影响因子：
5
通讯作者：
Pei-wen CONG
中科院分区：
文献类型：
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作者：
Sheng-chao JIANG;Qian GU;Pei-wen CONG
使用计算流体动力学（CFD）软件包OpenFOAM®研究了椭圆余弦波作用下，由靠近平面壁的盒子形成的窄间隙内的流体共振。研究了椭圆余弦波二阶谐波激励下的流体共振行为。数值模拟结果表明，在差距内存在较大的二阶诱导波高，且随入射波高的增大或水深的减小而增大。这一现象的主要原因是心轴波的大的双频分量。谐波分析表明，CFD结果可以很好地表示为一个二阶近似，自由表面的非线性是一个不可缺少的因素在椭圆余弦入射波的作用。水平波浪力也存在类似的现象。而差距内的二阶诱导共振对垂向波浪力的影响不明显。
Fluid resonance within a narrow gap formed by a box in close proximity to a plane wall under cnoidal wave action is investigated using the Computational Fluid Dynamics (CFD) package OpenFOAM®. Fluid resonance behavior excited by the second-order harmonic component of the incident cnoidal waves is concerned. Numerical simulations show the large second-order induced wave height in the gap which increases as the incident wave height gets larger or the water depth gets shallower. The large double-frequency component of the cnodial waves is the major reason for the phenomenon. Harmonic analysis indicates that the CFD results can be represented well by a second-order approximation, and the free surface nonlinearity is an indispensable factor in the action of the cnoidal incident wave. Similar phenomenon is also found in the horizontal wave force. However, the second-order induced resonance within the gap has insignificant effect on the vertical wave force.