Full-scale unsteady RANS CFD simulations of ship behaviour and performance in head seas due to slow steaming
Full-scale unsteady RANS CFD simulations of ship behaviour and performance in head seas due to slow steaming
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DOI：
10.1016/j.oceaneng.2015.01.011
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发表时间：
2015-03
影响因子：
5
通讯作者：
T. Tezdogan;Y. Demirel;Paula Kellett;Mahdi Khorasanchi;A. Incecik;O. Turan
中科院分区：
文献类型：
--
作者：
T. Tezdogan;Y. Demirel;Paula Kellett;Mahdi Khorasanchi;A. Incecik;O. Turan
能够估计船舶对波浪的响应是至关重要的，因为由此产生的阻力增加和速度损失可能导致延误或航线改变，从而产生财务影响。在当前的经济和监管环境下，慢蒸最近已成为商业船舶的一种流行方法，作为降低燃料消耗的一种方式，从而降低运营成本。传统的船舶运动研究方法是基于势流理论，不能考虑粘性效应。幸运的是，非定常的雷诺平均Navier-Stokes方程的计算能够将粘性和旋转的影响，在流动和自由表面波。本研究的主要目的是进行一个完全非线性非定常RANS模拟，以预测船舶运动和增加的阻力的全尺寸KRISO集装箱船模型，并估计增加的有效功率和燃料消耗，由于其在波浪中运行。使用商业RANS求解器，在设计速度和慢蒸汽速度下进行分析，覆盖一系列规则头波。对现有的实验数据的结果进行了验证，并发现与实验吻合良好。并将所得结果与势能理论的结果进行了比较。
It is critical to be able to estimate a ship׳s response to waves, since the resulting added resistance and loss of speed may cause delays or course alterations, with consequent financial repercussions. Slow steaming has recently become a popular approach for commercial vessels, as a way of reducing fuel consumption, and therefore operating costs, in the current economic and regulatory climate. Traditional methods for the study of ship motions are based on potential flow theory and cannot incorporate viscous effects. Fortunately, unsteady Reynolds-Averaged Navier–Stokes computations are capable of incorporating both viscous and rotational effects in the flow and free surface waves. The key objective of this study is to perform a fully nonlinear unsteady RANS simulation to predict the ship motions and added resistance of a full scale KRISO Container Ship model, and to estimate the increase in effective power and fuel consumption due to its operation in waves. The analyses are performed at design and slow steaming speeds, covering a range of regular head waves, using a commercial RANS solver. The results are validated against available experimental data and are found to be in good agreement with the experiments. Also, the results are compared to those from potential theory.