Numerical study of air cavity characteristics of bow wave breaking of KCS ship under different speeds

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-09-27 DOI:10.1007/s42241-024-0056-0

Tian-yi Mao, Feng-jun Bao, Jian-hua Wang, De-cheng Wan, Zhao-jie Wang

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引用次数: 0

Abstract

Ship bow wave breaking contains complex flow mechanism, which is very important for ship performance. In this study, a practical numerical simulation scheme for bow wave breaking is proposed and the scheme is applied to the simulation of bow wave breaking of KCS ship model with Fr = 0.26, 0.30, 0.35, 0.40, analyzing the impact of speed on the bow wave breaking. The results indicate that an increase in speed leads to a significant rise in viscous pressure resistance and more pronounced bow wave breaking. Moreover, it is found that the traditional wave height function in OpenFOAM is not suitable for detailed studies of bow wave breaking. This study extracts different free surfaces through top and bottom views to further analyze the free surface overturning, droplet splashing, and cavity entrainment in bow wave breaking. Additionally, the spatial and temporal distribution of cavities at Fr = 0.40 is analyzed, revealing that cavity distribution is closely related to vortex structures and exhibits a periodic pulsation characteristic of approximately 12 s.

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不同航速下 KCS 船首破浪气腔特性的数值研究

船首破浪包含复杂的流动机制，对船舶性能非常重要。本研究提出了一种实用的艏部破浪数值模拟方案，并将该方案应用于 KCS 船模（Fr = 0.26、0.30、0.35、0.40）的艏部破浪模拟，分析了航速对艏部破浪的影响。结果表明，航速增加会导致粘压阻力显著上升，艏部破浪更加明显。此外，研究还发现 OpenFOAM 中的传统波高函数并不适合对艏波破碎进行详细研究。本研究通过顶视图和底视图提取了不同的自由面，进一步分析了弓形波破碎过程中的自由面翻转、液滴飞溅和空腔夹带。此外，还分析了 Fr = 0.40 时空腔的时空分布，发现空腔分布与涡旋结构密切相关，并表现出约 12 秒的周期性脉动特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Hydrodynamics MECHANICS-

自引率

12.00%

发文量

2374

审稿时长

4.6 months

期刊介绍： Journal of Hydrodynamics is devoted to the publication of original theoretical, computational and experimental contributions to the all aspects of hydrodynamics. It covers advances in the naval architecture and ocean engineering, marine and ocean engineering, environmental engineering, water conservancy and hydropower engineering, energy exploration, chemical engineering, biological and biomedical engineering etc.