NUMERICAL SIMULATION OF LIQUID CARGO SLOSHING IN TANKS OF FLOATING STRUCTURES

本课题研究了液货晃荡等液体冲击问题的数值模拟分析方法，为准确评估海洋结构物在剧烈水冲击作用下的结构强度，需要研究结构在短时间内幅值急剧变化的冲击载荷作用下的动力响应特性。因此，在这项研究中，开发了一种考虑流固耦合的数值模拟方法。新方法由两个求解器组成，即，利用计算流体动力学（CFD）进行流场分析和模态分析技术求解结构动态响应的求解器。流体压力、结构的运动和变形等信息，在模拟的每个循环中在两个数值解算器之间交换。为了验证数值模拟方法的准确性，还进行了一系列液滴模型实验。将不同厚度的铝板制成的二维圆柱壳模型投放到静水表面，测量了模型的运动和壳板上的应变。

In this research project, a numerical simulation method for the analysis of liquid impact problems such as the liquid cargo sloshing in tanks of marine structures were developed.In order to evalate accurately the structural strength of marine structures under severe water impact, it is necessary to study the characteristics of dynamic structural response to the impact load that changes the magnitude rapidly in a short period of time. In this study, therefore, a numerical simulation method that considers fluid-structure interaction is developed. The new method consists of two solvers, i.e., a slover that utilizes the computational fluid dynamics (CFD) for the flow field analysis and a modal analysis technique for solving the dynamic structural response. Information such as fluid pressure, motion and deformation of sturcture, etc., is exchanged between teh two numerical solvers at every cycle of simulation. A series of drop model experiment was also conducted to verify the accuracy of the developed numerical simulation method. In the experiment, two-dimensional cylindrical shell models made of aluminum plates with different thickness were dropped on to the calm water surface, and the motion of the models and strains on the shell plates were measured.