边界层网格尺度对高效舵水动力数值计算的影响

Research on impact of boundary layer grid scale in hydrodynamic performance computation of high effectiveness rudder

体现边界层网格尺度的主要参数为壁面y+值。为了研究边界层网格尺度在高效舵水动力计算中的影响,在网格数量无关性检查的基础上,针对几种典型的y+值,应用Standard k-ε湍流模型对一种新型随边扭曲高效舵进行水动力计算,将预报值与模型试验结果进行对比分析。结果表明,不同的壁面初始y+值得到的结果有一定差异,综合来看,当壁面初始y+值取在30时得到的计算结果与模型试验吻合度最好。

Nondimensional wall distance y plus is the main parameter of boundary layer grid.In order to investigate the impact of boundary layer grid scale in hydrodynamic performance computation of high effectiveness rudder,the computational fluid dynamics method was adopted to predict the hydrodynamic performance of a high effectiveness twisted rudder by several typical y plus value and the standard k-εmodel based on the mesh independence analysis.The numerical results were compared with physical experiment,which indicate that the numerical results exist differences among the different y plus value.The results could meet the satisfaction when the initial y plus value is about 30.