Practical Development of CIP based Cartesian Grid Method for Prediction of Seakeeping Performance in Rough Seas

本项目的成果如下：(1)改进了接口捕获方法THINC方案。对于采用移动可变网格的情况，改进的方法提高了自由曲面计算的精度。(2)提出了一种基于四元数的六自由度船舶运动计算方法。该方法已成功地进行了船舶在四分之一波浪中的数值模拟。(3)研究了基于笛卡尔网格法的流固耦合仿真。建立了用有限差分法和有限元法耦合的方法来模拟弹性薄板与自由表面流动的相互作用。(4)开发了基于三维CIP的笛卡尔网格代码的并行版本。并行代码可以在PC集群系统中进行非常大规模的数值模拟。

The achievements of this project are as follows.(1) THINC scheme, which is an interface capturing method, has been improved. The accuracy of the free surface calculation is increased by the improved method for the case using moving variable meshes.(2) A 6-DoF ship motion calculation method was developed by using quaternions. Numerical simulation of a ship in quartering waves has been successfully carried out by this method.(3) Fluid structure interaction simulation based on Cartesian grid method was studied. A coupled approach with a finite difference method and a finite element method was developed for simulating the interaction between free surface flows and a thin elastic plate.(4) A parallel version of the three-dimensional CIP based Cartesian grid code was developed. Very large-scale numerical simulations can be performed by the parallel code in PC cluster systems.