液舱晃荡与浮体运动耦合的二维与三维SPH模拟影响研究

Influence of 2D and 3D SPH Simulation on Tank Sloshing Coupled with Floating Body Motions

采用DualSPHysics开源代码对矩形液舱晃荡过程中的砰击载荷及强非线性流固耦合现象进行了模拟,通过检验与验证分析证明了论文SPH求解器的准确性,并对不同方法的模拟结果进行了基准性研究。通过对菱形液舱内晃荡流动的模拟,研究了不同装载高度工况下二维与三维模拟对于舱壁砰击压力和晃荡流动的影响。最后针对载液浮箱在波浪中运动的内外域流动耦合问题进行模拟,分析了浮体运动和液舱晃荡二维与三维模拟结果的差异。研究表明,三维模拟中由于流场存在沿液舱宽度方向的运动分量,使得二维与三维液舱晃荡结果存在一定的差异,且低载液率工况的结果差异更大。

The sloshing loads and the strong nonlinear fluid-structure interaction phenomena are simulated by open source code DualSPHysics.The accuracy of the present SPH solver is verified by verification and validation study,and the simulation results of the sloshing flow in a rectangular tank by different methods are compared.Then,simulation of sloshing flow in rhombic tanks is conducted.The influence of 2D and 3D simulation on bulkhead slamming pressure and sloshing flow at different loading heights is studied.Finally,the internal and external flow coupled problem of a floating tank in waves is simulated.The difference in results of floating body motions and tank sloshing by 2D and 3D simulations is analyzed.This study indicates that tank sloshing results by 2D and 3D simulations are different due to the horizontal movement component of flow in the 3D tank.The difference is more obvious for lower water filling ratio cases.