复杂形状海洋浮体水动力系数计算(英文)

Calculation of Hydrodynamic Coefficients of Floating Body with Complex Wetted Surface

网格划分是水动力计算的关键环节,文中针对复杂形状海洋浮体提出了一种湿表面网格划分方法。对于有复杂首尾结构的浮体,用型线重构的方式在首尾生成曲面构成所需要的截面线,将通用建模工具和NURBS曲线拟合相结合,生成相贯结构的相交线;然后,用分片法生成浮体湿表面及内自由面网格,并独立表达各自的速度势以处理不规则频率现象,进而进行水动力系数计算。计算结果表明,上述处理方式很适合复杂形状海洋浮体水动力系数的计算。

Mesh generation is the key step of hydrodynamic calculation. A method of mesh generation is presented for floating bodies with complex wetted surface.For the floating body with complex bow and stern,the molded line reconstruction method is adopted to generate the section lines on the bow and on the stern which are necessary to construct the wetted surface,and it can raise efficiency greatly that the intersection lines of intersection structures are obtained by the way of combining modeling tool and NURBS technology;then the patch representation method is adopted in generating the mesh of wetted surface and interior free surface,and the velocity potentials on them are expressed separately,on basis of which the irregular frequency effect is dealt with in the calculation of hydrodynamic coefficients.The results show that the above methods are fit for the calculation of hydrodynamic coefficients.