Study of a Container Ship with Breaking Waves at High Froude Number Using URANS and DDES Methods

IF 1.3 4区 工程技术 Q3 ENGINEERING, CIVIL
Jianhua Wang, Z. Ren, D. Wan
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引用次数: 14

Abstract

The KRISO container ship model is used for numerical simulations to investigate hydrodynamic performance under high speeds. Unsteady Reynolds-Averaged Navier-Stokes (URANS) and delayed detached eddy simulation (DDES) approaches are used to resolve the flow field around the ship model. High-resolution Volume of Fluid (VOF) technique in OpenFOAM is used to capture the free surface. The present work focuses on the wave-breaking phenomena of high-speed ships. To study the speed effects on the phenomenon of ship bow wave breaking, three different speeds, i.e., Fn = .26, .35, and .40, are investigated for a fixed ship model in calm water. Predicted resistance and wave patterns under Fn = .26 are validated with available experimental data, and a good agreement is achieved. The breaking wave phenomena can be observed from both URANS and DDES results for Froude numbers greater than .35. And the Fn = .40 case shows more violent breaking bow waves. The process of overturning and breaking of bow wave is more complex in the DDES results, and some small-scale free surface features are also captured. The predicted bow wave is compared with the experiment conducted at the China Ship Scientific Research Center. It shows that the DDES results are more accurate. Wave profiles and vorticity field at several cross sections are presented to illustrate the relationship between bow waves and vortices. It is found that the free surface vorticity dissipates quickly in the URANS simulation, which leads to the difference compared with the DDES results.
用URNS和DDES方法研究集装箱船在高弗劳德数下的破碎波
采用KRISO集装箱船模型对高速下的船舶水动力性能进行了数值模拟。采用非定常reynolds - average Navier-Stokes (URANS)方法和延迟分离涡模拟(DDES)方法来求解船舶模型周围的流场。OpenFOAM中的高分辨率流体体积(VOF)技术用于捕获自由表面。本文主要研究高速船舶的破波现象。为了研究航速对船首破波现象的影响,在静水中对固定船模进行了三种不同航速Fn = .26、.35和.40的研究。用已有的实验数据验证了Fn = .26下的预测电阻和波形,结果吻合较好。当弗劳德数大于0.35时,URANS和DDES结果均可观察到破碎波现象。Fn = .40的情况显示出更猛烈的弓形波。在DDES结果中,弓形波的翻转和破碎过程更为复杂,并且还捕获了一些小尺度的自由表面特征。并与中国船舶科学研究中心的试验结果进行了比较。结果表明,DDES计算结果更加准确。为了说明弓形波与涡的关系,文中给出了几个截面上的波浪剖面和涡度场。发现在URANS模拟中,自由表面涡度耗散较快,这与DDES模拟结果存在差异。
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 Ship Research
Journal of Ship Research 工程技术-工程:海洋
CiteScore
2.80
自引率
0.00%
发文量
12
审稿时长
6 months
期刊介绍: Original and Timely technical papers addressing problems of shipyard techniques and production of merchant and naval ships appear in this quarterly publication. Since its inception, the Journal of Ship Production and Design (formerly the Journal of Ship Production) has been a forum for peer-reviewed, professionally edited papers from academic and industry sources. As such, it has influenced the worldwide development of ship production engineering as a fully qualified professional discipline. The expanded scope seeks papers in additional areas, specifically ship design, including design for production, plus other marine technology topics, such as ship operations, shipping economic, and safety. Each issue contains a well-rounded selection of technical papers relevant to marine professionals.
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