一种船体及周围自由面的网格自动生成方法

船体湿表面及船体周围的自由面网格自动生成技术是采用Rankine源方法进行水动力分析的基础.文中使用累加弧长三次参数样条函数生成船体湿表面网格,使用无限插值的方法生成自由面网格,运用拉伸变换确定自由面网格外边界上的结点分布以控制自由面面元的疏密.使用该方法生成的网格进行了水动力分析,计算结果表明该方法准确灵活,可以满足使用Rankine源方法对船舶进行水动力分析的需要.

3D mesh auto-generating method of ship hull and free surface

The mesh auto-generating technique for ship wetted surface and free surface is the basis of implementing hydrodynamic analysis by the Rankine method. The accumulative arc length cubic parameter spline is applied for the mesh auto-generating of ship wetted surface. The transfinite interpolation scheme is employed for the mesh auto-generating of free surface. In order to control the density of panels on the free surface, the stretching transformation is used to determine the distribution of nodes at the outer boundary of free surface. The hydrodynamic analyses are performed with the generated mesh. The numerical results show that this method has good accuracy and high flexibility to meet the need of the hydrodynamic analysis by Rankine method.