Study of a Container Ship with Breaking Waves at High Froude Number Using URANS and DDES Methods
Study of a Container Ship with Breaking Waves at High Froude Number Using URANS and DDES Methods
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使用 URANS 和 DDES 方法研究高弗劳德数破浪集装箱船
DOI：
10.5957/josr.09180081
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发表时间：
2020-12
影响因子：
1.4
通讯作者：
Decheng Wan
中科院分区：
文献类型：
--
作者：
Jianhua Wang;Zhen Ren;Decheng Wan
采用KRISO集装箱船模型对高速下的水动力性能进行了数值模拟。采用非定常雷诺平均Navier-Stokes方程（URANS）和延迟分离涡模拟（DDES）方法求解船模绕流场。采用OpenFOAM中的高分辨率流体体积（VOF）技术捕捉自由表面。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，采用了三种不同的航速，Fn = .26，.35，和.40，研究了一个固定的船模在静水中。在Fn = 0.26的情况下，预测的阻力和波型与现有的实验数据进行了验证，并取得了良好的一致性。当弗劳德数大于0.35时，从URANS和DDES的结果中都可以观察到破碎波现象。Fn = 0.40的情况下，显示出更强烈的破碎弓形波。DDES模拟结果中，首波的翻转破碎过程较为复杂，也捕捉到了一些小尺度的自由面特征。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的计算结果更准确。给出了几个横截面上的波浪剖面和涡量场，以说明船首波和涡的关系。结果表明，在URANS模拟中，自由表面涡量耗散较快，导致与DDES模拟结果的差异。
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.
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