基于SPH方法的救生艇入水砰击数值模拟  

Simulation of water entry of a lifeboat by the SPH method

作　　者：胡杰[1] 谢荣[1] 

机构地区：[1]江苏海事职业技术学院船舶与海洋工程学院,南京211170

出　　处：《江苏科技大学学报（自然科学版）》2017年第6期701-706,共6页Journal of Jiangsu University of Science and Technology:Natural Science Edition

摘　　要：救生艇在自由抛落过程中将与水面发生砰击现象,伴随自由面的破碎、飞溅等强非线性特征,采用拉格朗日系统光滑粒子法(SPH)对该剧烈流动现象进行数值研究.首先对二维楔形体的自由落水过程进行模拟,并与试验结果进行了对比,验证了文中SPH计算程序在艇体入水问题上具有较好的可靠性.随后,考察了楔形艇体截面的舭部夹角对入水过程中自由面的演化过程及结构运动产生的影响.最后,将SPH方法拓展至三维救生艇的入水过程模拟研究中,分析了艇体入水后的自由面变化及艇体运动的三维特征.数值结果表明,SPH方法能够成功应用于具有复杂自由面变化的救生艇入水砰击问题研究.The slamming event induced by a free-falling lifeboat impacting onto water surface is non-linear since it is accompanied by breaking,splashing of free surface. In this paper,the smoothed particles hydrodynamics（SPH） method described in the Lagrangian system is employed for the numerical simulation of the violent free surface flow. Firstly,the two-dimensional（2 D） benchmark of a free-falling wedge is investigated,and the numerical results are in good agreements with published experimental data. The comparison study shows that our SPH code is capable of solving water entry problems. Then,influences of the dead-rise angles of wedge sections of lifeboat on the evolution of water surface and motion of the structure are studied. Finally,the process of water entry of a three-dimensional（3 D） lifeboat is simulated with the SPH code. The 3 D features of free surface evolution and motions of the lifeboat are analyzed. According to the numerical results,the SPH method is feasible for water entry problems with violent free surface deformations.

关 键 词：光滑粒子法(SPH) 楔形体 小艇 入水 砰击 

分 类 号：O35[理学—流体力学]