一种基于体积力螺旋桨模型的自航计算方法

文章以集装箱船模型KCS(KRISO Container Ship)为研究对象,基于通用CFD软件FLUENT 12.0.16,采用螺旋桨体积力模型,实现了模型尺度下实船自航点的全粘带自由面计算。该文的计算包括静水拖航计算、自航计算,以及扭矩对自航计算结果的影响分析。通过与试验值的分析比较,验证了该方法的有效性。由于采用了完全结构化的六面体网格,带对称面的计算域单元数仅为33万。研究结果还表明:考虑扭矩的全流场计算对于改善流动细节,获得更精确的计算结果是有利的,但计算量有所增加。

Computation on self-propulsion at ship point based on a body-force propeller

Based on a body-force propeller model, the viscous self-propulsion flow field with free surfaces of model-scaled KRISO container ship KCS at ship point is numerically simulated with general CFD code FLUENT 12.0.16. The computation method of self-propulsion is validated by comprehensive comparison be-tween computational results and experimental data. The mesh used in this paper is completely structured hex-ahedral cells and the comparison on flow details between computed results and experimental data is good, so the 330 000 cell mesh is also proved as high effective. Both the model ship towed test and self propelled test at ship point in still water are numerically simulated. And for the self-propulsion computation, either case with or without considering torque is computed. The results show that considering torque is favorable to im-prove the computation accuracy and capture the flow features, but with additional computational expense.