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URANS simulations for a free-running container ship: Part 1. Turning-circle
Journal of Hydrodynamics ( IF 2.5 ) Pub Date : 2021-07-05 , DOI: 10.1007/s42241-021-0052-6
Dong-Hwan Kim 1, 2 , Yugo Sanada 1 , Sungtek Park 1 , Frederick Stern 1 , Hamid Sadat-Hosseini 3
Affiliation  

The incompressible unsteady Reynolds-averaged Navier-Stokes (URANS) simulations are performed for a free-running container ship in maneuvering conditions: the starboard and portside turning circle simulations with 35° rudder deflection. The validation variables include trajectory, motions, and propeller performances, and the prediction shows acceptable agreements against the experimental data. During the steady-state part of the turning, the inertial forces balancing the local forces are reported to quantitatively assess the centrifugal force which appears from the force equilibrium between the rudder, propeller, and the bare-hull. The study on the local flow focuses on finding the correlations between the propeller inflow and the propeller performance to investigate the differences in propeller performances during the portside and starboard turning. The preliminary simulations, performed with the grid triplet, comprise propeller open-water, resistance, and self-propulsion simulations, from which the validation studies and the studies for the local force and the local flow are fulfilled and applied for the main simulations. Both propeller and rudder are fully discretized and controlled, mimicking the experiment. Level-set, overset approach and Mentor’s SST model are employed for the free-surface capturing, large motion prediction, and turbulence closure.



中文翻译:

一艘自由航行的集装箱船的 URANS 模拟:第 1 部分。转圈

不可压缩非定常雷诺平均纳维-斯托克斯 (URANS) 模拟是在操纵条件下为自由航行的集装箱船执行的:右舷和左舷转弯圆模拟,舵偏转为 35°。验证变量包括轨迹、运动和螺旋桨性能,预测结果与实验数据一致。在转弯的稳态部分,平衡局部力的惯性力被报告以定量评估从舵、螺旋桨和裸船体之间的力平衡中出现的离心力。局部流研究的重点是寻找螺旋桨流入量与螺旋桨性能之间的相关性,以研究在左舷和右舷转弯过程中螺旋桨性能的差异。使用网格三元组进行的初步模拟包括螺旋桨开放水域、阻力和自航模拟,从中完成验证研究以及对局部力和局部流的研究,并应用于主要模拟。螺旋桨和方向舵都是完全离散化和受控的,模拟实验。水平集、重叠方法和 Mentor 的 SST 模型用于自由表面捕获、大运动预测和湍流闭合。和自推进模拟,其中验证研究以及对局部力和局部流的研究得到满足并应用于主要模拟。螺旋桨和方向舵都是完全离散化和受控的,模拟实验。水平集、重叠方法和 Mentor 的 SST 模型用于自由表面捕获、大运动预测和湍流闭合。和自推进模拟,其中验证研究以及对局部力和局部流的研究得到满足并应用于主要模拟。螺旋桨和方向舵都是完全离散化和受控的,模拟实验。水平集、重叠方法和 Mentor 的 SST 模型用于自由表面捕获、大运动预测和湍流闭合。

更新日期:2021-07-12
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