CFD based form factor determination method
CFD based form factor determination method
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DOI：
10.1016/j.oceaneng.2020.108451
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发表时间：
2021-01
影响因子：
5
通讯作者：
K. Korkmaz;S. Werner;N. Sakamoto;P. Queutey;G. Deng;Gao Yuling;Dong Guoxiang;K. Maki;H. Ye;A. Akinturk;T. Sayeed;T. Hino;Feng Zhao;T. Tezdogan;Y. Demirel;R. Bensow
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文献类型：
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作者：
K. Korkmaz;S. Werner;N. Sakamoto;P. Queutey;G. Deng;Gao Yuling;Dong Guoxiang;K. Maki;H. Ye;A. Akinturk;T. Sayeed;T. Hino;Feng Zhao;T. Tezdogan;Y. Demirel;R. Bensow
1978年ITTC功率预报法是通过拖曳水池试验预报船舶推进功率的方法。该方法中的形状因子方法及其确定受到质疑。本文研究了通过引入CFD/EFD组合方法来改进功率预测的可能性，在该方法中，形状因子的实验确定被应用于开式壳体KVLCC 2和KCS的双体RANS计算所取代，包括首次发表的KVLCC 2在压载条件下的拖曳水池试验，包括专门针对形状因子推导的实验不确定性分析。九个组织和七个CFD代码的计算进行了比较的实验。在设计载荷条件下，两种船体的形状系数预测与实验结果相比，一般情况下。对于KVLCC2压载条件，大多数形状因子都低于预测值，同时保持在实验不确定性范围内。速度依赖性与ITTC 57线的应用程序中观察到，但它是减少与Katsui线和数值摩擦线几乎消除。通过模型比例外推和直接全尺寸计算获得的全尺寸粘性阻力预测结果的比较表明，CFD/EFD组合方法的分散性明显较小，因此可能是首选方法。
The 1978 ITTC Power Prediction method is used to predict the propulsive power of ships through towing tank testing. The form factor approach and its determination in this method have been questioned. This paper investigates the possibility to improve the power predictions by introducing Combined CFD/EFD Method where the experimental determination of form factor is replaced by double body RANS computations applied for open cases KVLCC2 and KCS, including first-time published towing tank tests of KVLCC2 at ballast condition including an experimental uncertainty analysis specifically derived for the form factor. Computations from nine organisations and seven CFD codes are compared to the experiments. The form factor predictions for both hulls in design loading condition compared well with the experimental results in general. For the KVLCC2 ballast condition, majority of the form factors were under-predicted while staying within the experimental uncertainty. Speed dependency is observed with the application of ITTC57 line but it is reduced with the Katsui line and nearly eliminated by numerical friction lines. Comparison of the full-scale viscous resistance predictions obtained by the extrapolations from model scale and direct full-scale computations show that the Combined CFD/EFD Method show significantly less scatter and may thus be a preferred approach.