In offshore oil and gas exploration and transportation, it is often encountered that the multi-floating structures work side by side. In some sea conditions, there is a strong coupling between the multi-floating structures that seriously affects the safety of offshore operations. Therefore, the prediction of the relative motion and force between the multi-floating structures and the wave elevation around the multi-floating-system has become a hot issue. At present, the problem of double-floating-system is mostly based on linear potential flow theory. However, when the gap width between two floating bodies is small, the viscous and nonlinear effects are not negligible, so the potential flow theory has great limitations. Based on the viscous flow theory, using the finite difference solution program of FLOW3D and using volume of fluid technology to capture the free surface, a three-dimensional numerical wave basin is established, and the numerical results of the wave are compared with the theoretical solution. On this basis, the hydrodynamic model of side-by-side double-floating-system with a narrow gap is established, and the flow field in the narrow gap of the fixed double-floating-system under the regular wave is analyzed in detail. The law of the gap-resonance is studied, which provides valuable reference for the future research on the multi-floating-system.

中文翻译：

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波浪间隙较窄的并排双浮系统水动力振荡的数值模拟

在海上油气勘探和运输中，经常会遇到多层浮式结构并排工作的情况。在某些海况下，多层浮式结构之间存在牢固的耦合，严重影响了海上作业的安全性。因此，关于多层浮体之间的相对运动和力以及多层浮体系统周围的波高的预测已成为一个热门问题。目前，双浮系统的问题主要基于线性势流理论。但是，当两个浮体之间的间隙宽度较小时，粘性和非线性效应是不可忽略的，因此势流理论具有很大的局限性。根据粘性流理论，利用FLOW3D的有限差分求解程序，利用流体量技术捕获自由表面，建立了三维数值波盆，并将波的数值结果与理论解进行了比较。在此基础上，建立了间隙较窄的并列双浮系统的水动力模型，并详细分析了固定双重浮式系统在规则波作用下窄间隙内的流场。研究了间隙共振定律，为以后的多浮系统研究提供了有价值的参考。建立了间隙较窄的并排双浮系统的水动力模型，并详细分析了规则波动条件下固定式双重浮系统的窄间隙内的流场。研究了间隙共振定律，为以后的多浮系统研究提供了有价值的参考。建立了间隙较窄的并排双浮系统的水动力模型，并详细分析了规则波动条件下固定式双重浮系统的窄间隙内的流场。研究了间隙共振定律，为以后的多浮系统研究提供了有价值的参考。