基于改进格子玻尔兹曼方法的砰击涌浪模拟

Simulation of slamming surge based on lattice Boltzmann method

针对船舶与落石入水砰击涌浪灾害问题,采用浸入式边界-格子玻尔兹曼方法对二维楔形块入水涌浪问题进行了研究。从格子玻尔兹曼方法、基于流体体积法(VOF)的自由液面模型以及浸入式边界法的原理出发,阐述了其可以用来模拟有自由液面的流固耦合问题的理论基础,并优化了界面格子处浸入式边界力的求解方法。采用此方法模拟了楔形块体入水抨击实验,通过对模拟的块体速度与位置和实验结果进行比较,两者吻合良好,论文此方法模拟有自由液面的流固耦合问题具有较好的可行性。

The immersed boundary-lattice Boltzmann method is used to study the two-dimensional wedge block water entry. Based on the principle of the lattice Boltzmann method, the free surface model based on the volume of fluid method(VOF), and the immersed boundary method, we explain the theoretical basis that the combination of the three method can be used to simulate the fluid-structure interaction with a free surface. An improved method for calculating the immersed boundary force is presented. This method is used to simulate the slamming problem of the wedge block falling into the still water. The good agreements between the simulated results and the experimental results show that this method is feasible for the fluid-structure interaction with a free surface.