摘要随着船舶制造和运输行业以及海洋工程制造产业的持续发展，全世界对海洋资源 开发的深度、广度和力度不断增加。单一的海洋浮式结构物已无法满足开发生产的实 际需求，我们将面临更多有关于多浮体协同作业的问题。在某些海况下，多浮式结构 之间会出现严重影响海上作业安全性和稳定性的强耦合作用情况，因此，开展海洋浮 式结构窄缝间流场的水动力特性分析，不仅具有深远的理论意义，而且具有重要的应 用价值。79824

相对于复杂的海洋工程问题，国内外学者对考虑液舱晃荡情况下的多浮体水动力 学问题以及多浮式结构系统与系泊系统之间的耦合作用等方面展开了卓有成效的研 究。但是，对两固定浮式结构窄缝之间的流场分析以及对窄缝间流场水动力耦合作用 的研究还处于起步阶段，我们还需要不断深入研究。

本文基于粘流理论以及计算流体力学（CFD）理论，并采用基于全六面体非结构 化网格技术求解粘性雷诺数平均方程的自由液面捕捉法，利用较成熟的 CFD 商业软件 FINE/Marine，对两固定浮式结构窄缝间的流场问题进行了数值模拟以及结果分析。 本次研究还通过观察窄缝间流场的波面升高，对比探究不同波浪周期（波浪频率）、 不同窄缝间距对窄缝间流场的影响，并对窄缝间流场的水动力共振问题进行了规律探 索。最后，本文还对不同波浪入射方向、不同模型参数的模拟结果进行了对比探究， 为后续窄缝间流场的分析研究奠定了基础。

毕业论文关键词：浮式结构；窄缝间流场；计算流体力学；数值模拟；水动力共振

Abstract With the continuous development of shipbuilding and ship transport industry and manufacturing industry of ocean engineering, the demand for exploiting marine resource from all over the world escalates。 Single floating body cannot satisfy the real demand for offshore development and production。 We will be confronted with increasing synergetic work of multiple floating structures。 In some sea conditions, strong coupling may occur among multiple floating structures, which badly affects the security and stability  of offshore operations。 Accordingly, carrying out the analysis of flow field in the narrow gap of two fixed floating structures not only has remarkable and far-reaching significance, but also has significant value of engineering and application。

Compared with some complicated ocean engineering problems, scholars have carried out many studies in multiple floating structures with liquid tank sloshing and their hydrodynamic interaction。 However, the analysis of flow field in the narrow gap of two fixed floating structures has still been in the start stage, which needs us to carry out further studies。

Based on viscous fluid mechanics and computational fluid dynamics, flow field in the narrow gap of two fixed floating structures is simulated numerically in this thesis via a kind of commercial CFD software called FINE/Marine, and its computational result is also analyzed。 Based on all-hexahedral and unstructured mesh generation technique which is used to solve averaged equations of viscous Reynolds number, a kind of free surface capture is adopted in this thesis。 The influence on flow field in narrow gap from different distances between structures and different wave frequencies is analyzed and compared via observing wave elevation。 The exploration of hydrodynamic resonance is also carried  out in this thesis。 At last, the simulation results of different incident wave directions and different model shapes are compared and discussed, which provides valuable reference for the further analysis of flow field in narrow gap。

Keywords: floating structure; flow field in close proximity; computational fluid dynamics; numerical simulation; hydrodynamic resonance。