Research On Characteristics Of Ship Structure In Collision Account For Sloshing Interaction

In the recent years, scholars in and abroad have carried out many research works on ship collisions. However, because of the complexity of ship collision problem and solving technique limitation, conventional calculation methods used to simulation ship collisions do not normally include the fluid-structure interaction. It's of great significance to carry out research work on the structural crashworthiness of liquid filled ships account for fluid-structure interaction.Based on the research of numerical simulation technology for ship collision accounted for liquid cargo, non-linear FEM software ANSYS/LS-DYNA was adapted to analyze collision damage mechanism account for the influence of fluid-structure interaction. Comparison analysis was performed by the conventional calculation methods. The main researches and conclusions in the paper are as follows:(1) Introduce the progress of ship collisions and the methods of ship collisions account for fluid-structure were investigated. Study on the basic theory of nonlinear FEM, especially, numerical simulation methods and skills about ship collision. Some preparations were made for the structural crashworthiness of liquid filled ships account for fluid-structure interaction.(2) Non-linear FEM software ANSYS/LS-DYNA was adapted to built two non-linear finite element models of side collision of ships in the paper to study the side structure collision characteristics. By the research of collision simulations, we obtained the curve of relative between force and time of the colliding ship, deformation and time of colliding ship and energy and time of the colliding ship, and the effect of the simplification is study by comparison.(3) Numerical simulations were conducted on the influence of liquid cargo on the structure collision resistance in full load condition for a VLCC was studied by the code of ANSYS/LS-DYNA. Compared to the conventional calculation methods, the collision force increased and the damage characteristics for inner side plate changed and the inner side plate was broken earlier because of the fluid-structure interaction.