基于CFD船舶操纵性预报方法研究

基于CFD技术和重叠网格技术完成了黏性流场中KVLCC2船模的操纵性水动力导数的数值计算。为保证计算的精确性,进行了网格的收敛性分析,给出了合适的网格划分方法;通过数值模拟斜航运动、纯横荡运动和纯艏摇运动计算出的水动力与相应条件下的试验值对比,计算结果与试验值吻合良好,计算出的水动力导数准确度较高。基于MMG分离建模方法建立KVLCC2船模的操纵性数学模型,利用龙格-库塔算法求解微分方程组,对船舶操纵运动进行仿真。回转试验和Z形操舵试验的仿真结果与试验结果对比,其回转直径和轨迹都非常吻合,表明采用的船舶操纵性预报是可行的。

A CFD-based research on the method of predicting ship maneuverability

Based on CFD technology and overlap grid technology, the hydrodynamic derivatives of KVLCC2 model in viscous flow field were calculated. In order to ensure the accuracy of calculation, the convergence of grid was analyzed, and a suitable mesh generation method was adopted. By means of comparing the hydrodynamic forces calculated by simulating the oblique motion, pure sway motion and pure yaw motion with experimental values, it was found that the results calculated by this method were in good agreement with the experimental values and the accuracy of the calculated hydrodynamic derivatives was ideal. Based on MMG separately building model idea, a mathematical model was established to simulate ship maneuvering motion and the differential equations were solved by Runge-Kutta algorithm. The comparison between the simulation results and the experimental results showed that the tactical diameter and trajectories were very consistent. The method adopted by this paper is feasible and can satisfy the requirements of maneuverability design and prediction.