规则波浪中两个类船漂浮结构的水动力相互作用的 URANS 预测

Q2 Mathematics CFD Letters Pub Date : 2024-07-21 DOI:10.37934/cfdl.16.12.117
Fahmy Ardhiansyah, Rudi W Prastianto, Eko Budi Djatmiko, Ketut Suastika
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引用次数: 0

摘要

并排配置的浮动结构常用于海洋勘探实践,如用于装载和卸载的近海船舶、浮式起重机和近海浮式风力涡轮机。计算流体动力学(CFD)方法是目前分析并排船舶水动力相互作用的常用方法。本研究的目的是对用于上述分析的 CFD 方法进行基准研究。采用 URANS CFD 方法,利用 k-ε 湍流模型和流体体积 (VOF) 方法捕捉自由表面。研究中考虑了波长与容器长度的不同比率以及容器之间的不同间隙。模拟结果表明,波长与容器长度之比 /L 对容器周围和间隙内的波型影响很大。对于较短的波,间隙对间隙内外的波型都有影响。此外,船舶龙骨表面的压力分布与沿船舶的垂直中心平面不对称,这导致即使船舶处于迎面海面也会发生翻滚运动。在考虑的所有间隙变化中都观察到了翻滚运动。在起伏和俯仰运动中观察到振幅调制,而在滚动运动中观察到边带频率成分的产生,这表明存在非线性流体-结构相互作用。
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URANS Prediction of the Hydrodynamic Interactions of Two Ship-like Floating Structures in Regular Waves
A side-by-side configuration of floating structures is commonly used in ocean exploration practices, such as offshore vessels for loading and offloading, floating cranes, and offshore floating wind turbines. Computational Fluid Dynamics (CFD) method is current practice for the analysis of hydrodynamic interactions of the side-by-side vessels. The purpose of this study is yo carry out a benchmark study of CFD method applied for the above analysis. URANS CFD method was applied utilizing a k-ε turbulence model and a volume of fluid (VOF) method to capture the free surface. Different ratios of wave length to vessel’s length and different gaps between between the vessels were considered in the study. Simulation results show that the wave length to vessel’s length ratio /L affects significantly the wave pattern around the vessels and inside the gap. For the shorter waves, the gap influences the wave pattern both inside and outside the gap. Further, the pressure distribution on the keel surface of the vessels is asymmetric about the vertical center plane along the vessel, which resulted in roll motion eventhough the vessel is in head seas. Roll motion was observed in all gap variations considered. Amplitude modulation was observed in the heave and pitch motions, while generation of side-band frequency components were observed in the roll motion, which indicate a non-linear fluid-structure interaction.
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来源期刊
CFD Letters
CFD Letters Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
3.40
自引率
0.00%
发文量
76
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