轴对称体砰击载荷的三维动网格数值计算  

Numerical Calculation of the Slamming Load for Axisymmetric Geometries Using 3D Dynamic Mesh

作　　者：闫发锁 于龙超 赵九龙 张大刚 

机构地区：[1]哈尔滨工程大学,黑龙江哈尔滨150001 [2]沪东中华造船(集团)有限公司,上海2001293

出　　处：《中国海洋大学学报（自然科学版）》2017年第5期113-120,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(51379051)资助~~

摘　　要：基于三维边界元方法研究了三维轴对称体入水砰击载荷的数值算法。算法从三维力学模型出发,继承了Wagner自由液面抬升理论,引入浸深因子Cw以确定自由液面抬升高度,并且将自由液面线性化处理,同时考虑网格运动,在自由液面附近对网格进行截断重构,以确保水下湿面积的精准。算法中使用考虑加权运动项的非线性伯努利方程计算得到入水结构的表面压力,进一步积分可得入水结构的总体受力。此外,文中分别通过Nisewanger的圆球入水试验与Alaoui的圆锥入水试验对算法的正确性及适用性进行了验证。A numerical method for prediction of the slamming load from axisymmetric geometries based on 3D BEM was introduced in this paper. The hydrodynamic model based on Wagner＇s theory were utilyzed in the numerical code, which considers the rising of free water surface during impact. In the method, wetting factor Cw was introduced to ensure the exact height of the uplift free surface. At the same time the grid＇s movement was also considered here and along the interface between the geometry and the free surface one group of grids were modified for a precise wet area. The Nonlinear Bernoulli equation considering the grid＇s movement is used for calculating the hydrodynamic pressure and the force could be got through integration. Results from slamming test for 3D bodies in reference [10] and [15] were introduced to prove validity of the menthod.

关 键 词：轴对称体 砰击载荷 自由液面 网格重构 

分 类 号：U661.4[交通运输工程—船舶及航道工程]