Numerical Prediction of the Added Resistance of Ships in Waves

Numerical Prediction of the Added Resistance of Ships in Waves
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船舶波浪中附加阻力的数值预测

DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
O. E. Moctar
O. E. Moctar
中科院分区：
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文献类型：
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作者：
Jens Ley;S. Sigmund;O. E. Moctar

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波浪中的附加阻力使用两种不同的雷诺平均纳维-斯托克斯方程（RANSE）求解器，即Comet和interFoam （OpenFOAM）来计算不同船型的附加阻力。因此，将RANS方程隐式地与六自由度的非线性运动方程耦合，并通过网格变形算法扩展求解器以考虑船舶运动。与基于势流的模拟相比，这些模拟的计算量很高，特别是对于短波。然而，为了理解与船舶附加阻力相关的物理特性并研究影响参数，基于RANS方程的场方法可能是合适的。波浪中附加阻力的预测包括两个步骤；静水阻力和波浪中总阻力的计算。研究了离散误差以及浪涌运动对附加阻力的影响。此外，在衍射和辐射问题中，附加电阻被分解，就像在势理论中通常做的那样。ASME版权所有©2014
The added resistance in waves is computed for different ship types using two different Reynolds-Averaged Navier-Stokes Equations (RANSE) solvers, namely Comet and interFoam (OpenFOAM). Hence, the RANS equations are implicitly coupled with the non-linear equations of motions for six degrees of freedom and the solvers are extended by algorithms for mesh morphing to account for ship motions. The computational effort for these simulations is high compared to potential flow based simulations, especially for short waves. However, to understand the physics related to added resistance of ships and to investigate influencing parameters, field methods based on RANS equations may be suitable. The prediction of the added resistance in waves consists of two steps; the computations of the calm water resistance and the total resistance in waves. The discretisation errors as well as the influence of the surge motions on the added resistance are investigated. Further, the added resistance is decomposed in diffraction and radiation problems as it is commonly done in potential theory.Copyright © 2014 by ASME