CFD prediction of unsteady forces on marine propellers caused by the wake nonuniformity and nonstationarity
CFD prediction of unsteady forces on marine propellers caused by the wake nonuniformity and nonstationarity
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DOI：
10.1016/j.oceaneng.2015.06.007
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发表时间：
2015-08
影响因子：
5
通讯作者：
N. Abbas;N. Kornev;I. Shevchuk;P. Anschau
中科院分区：
文献类型：
--
作者：
N. Abbas;N. Kornev;I. Shevchuk;P. Anschau
介绍并分析了不同工程方法和数值方法对KVLCC2油轮尾部螺旋桨非定常载荷的计算结果。Kornev et al.（2011）提出的混合URANS-LES模型应用于同时包含船舶和旋转螺旋桨的布置，并考虑了所有相互作用的影响。将数值结果与工程方法得到的结果进行比较，可以验证基于强简化的经验估计。三种考虑的工程方法中的两种给出了力和力矩波动的标准偏差，其精度足以满足实际目的。然而，混合模型预测存在任何工程方法无法检测到的强峰值载荷（推力标准偏差的三倍）。混合计算还表明，在裸壳情况下，除了在船尾区域存在常见的舱底涡外，还存在强烈的横向结构。旋转螺旋桨的存在由于对船舶边界层的吸力作用而破坏了这些附加结构。
Results of computations of the unsteady loadings on marine propellers behind the KVLCC2 tanker using different engineering and numerical methods are presented and analyzed. The hybrid URANS–LES model presented in Kornev et al. (2011) is applied to the arrangement containing both the ship and the rotating propeller with consideration of all interaction effects. Comparison of numerical results with these obtained from engineering methods allows one to validate the empirical estimations based on strong simplifications. Two of three considered engineering methods give standard deviations of the force and moment fluctuations with the accuracy sufficient for practical purposes. However, the hybrid model predicts the existence of strong peak loading (three times larger than the standard deviation for the thrust) that are not detected by any engineering methods. Hybrid computations also show the existence of strong transversal structures in addition to common bilge vortices in the ship stern area in the case of a bare hull. The presence of the rotating propeller destroys these additional structures due to suction effect on the ship boundary layer.