液舱晃荡载荷数值模拟中的流固耦合影响研究

Investigation to the numerical simulation approach for sloshing in tanks considering fluid-structure interaction

为了研究大型化后LNG船液舱围护系统结构弹性对液舱内晃荡冲击压力的影响,采用基于显式时间积分方法的有限元/有限体积法程序模拟流体和结构的运动和变形及其相互作用。论述了数值模拟方法及其重要相关参数,以二维矩形刚性液舱模型为例模拟晃荡,得到的结果分别与计算流体程序和试验的结果比较,论证了该数值计算方案的可行性。进一步进行了三维刚性和三维弹性模型的液舱晃荡分析,比较了不同模型对液体运动和舱壁冲击压力的影响。文中研究结果对液舱结构晃荡冲击载荷评估具有参考价值。

To study the effect of elastic structures in the containment system on sloshing impact pressures,a numerical approach with fluid-structure coupling technique based on explicit time integral FEM/FVM was developed for simulating motions of flow and fluid-structure interaction.The numerical approach with im-portant parameters was addressed first and was applied to 2D rigid rectangular tank case.The computational results were validated against CFD results and existing experimental data,showing good agreement.Then sloshing simulations in 3D rigid and elastic rectangular tank cases were carried out and the different effects on liquid motions in the tank and impact pressures on the walls were discussed.The results are meaningful to sloshing loads evaluation.