Numerical simulation of wave resonance in the narrow gap between two non-identical boxes
Numerical simulation of wave resonance in the narrow gap between two non-identical boxes
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DOI：
10.1016/j.oceaneng.2018.02.055
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发表时间：
2018-03
影响因子：
5
通讯作者：
Sheng-Chao Jiang;W. Bai;G. Tang
中科院分区：
文献类型：
--
作者：
Sheng-Chao Jiang;W. Bai;G. Tang
采用基于OpenFOAM®软件的二维数值波浪水槽，研究了两个并排不同形状盒子之间狭窄缝隙中的波浪共振问题。研究的重点是考察在共振条件下能量转换和能量耗散对波浪响应的水动力行为的影响。数值模拟表明，线性势流模型在窄缝隙中产生的不切实际的波共振响应，不仅是由于流体旋转运动引起的能量耗散，而且是与自由表面有关的能量转换的结果。随着入射波幅的增大，反射的能量相对较多，导致共振频率处窄缝内的波共振响应和能量耗散减小。在略远离共振频率时，随着入射波幅的增大，能量耗散成为窄缝内波响应减小的主要因素。对于缝隙结构的影响，一方面，对于上游小、下游大的典型情况，消能起主导作用。而对于典型的上游大、下游小的箱形吃水，反射能量更为重要。随着缝隙宽度的增加，缝隙中存在更多的共振流体，导致反射系数减小，透射率增大。
Wave resonance in the narrow gap between two side-by-side non-identical boxes is investigated by employing a two-dimensional numerical wave flume based on the OpenFOAM®package. The focus of this study is to examine the influence of the energy transformation and the energy dissipation on the hydrodynamic behavior of wave response around resonant conditions. Numerical simulations show that the unrealistic wave resonant responses in the narrow gap by the linear potential flow model are due to not only the energy dissipation induced by the fluid rotational motion, but also the energy transformation associated with the free surface. With the increase of incident wave amplitude, relatively more energy is reflected, leading to the decrease of wave resonant response and energy dissipation in the narrow gap at the resonant frequency. When slightly away from the resonant frequency, the energy dissipation becomes the dominant factor for the decrease of wave response in the narrow gap with increasing the incident wave amplitude. As for the influence of gap configuration, on one hand, energy dissipation has the dominant effect for the typical case of small upstream and large downstream box drafts. On the other hand, the reflected energy is more important for the typical large upstream and small downstream box drafts. More resonant fluid exists in the gap with the increase of gap breadth, leading to the decrease of reflection coefficient and the increase of transmission coefficient.