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Numerical simulation of wave resonance in the narrow gap between two non-identical boxes

机译：两个不同盒子之间狭窄间隙中波共振的数值模拟

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摘要

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 (R) 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.
机译：通过使用基于OpenFOAM（R）软件包的二维数值波形水槽，研究了两个并排的异形盒之间狭窄间隙中的共振。这项研究的重点是研究能量转换和能量耗散对共振条件附近波浪响应的水动力行为的影响。数值模拟表明，线性势流模型在窄间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，而且还归因于与自由表面有关的能量转换。随着入射波幅值的增加，反射的能量相对更多，从而导致波共振响应的减小和共振频率处狭窄间隙中的能量耗散。当稍微偏离谐振频率时，随着入射波幅度的增加，能量耗散成为减小窄缝中波响应的主要因素。至于缝隙配置的影响，一方面，在小上游和大下游箱形气流的典型情况下，能量耗散具有主导作用。另一方面，对于典型的大型上游和下游小型箱式吃水，反射能量更为重要。随着间隙宽度的增加，间隙中存在更多的共振流体，导致反射系数的减小和透射系数的增大。

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