Euler多物质流体动力学数值方法中的界面处理算法

结合Euler型多物质流体动力学数值方法,将Youngs界面重构技术进行改进,改进后的算法中,混合网格周围网格物质的体积份额不但被用来计算物质界面的位置,还被用来确定混合网格中各物质的输运次序.将改进后的算法加入到自行开发的MMIC-2D通用多物质二维爆炸与冲击问题数值仿真程序中,对二维直角坐标系下圆环在平移流场中的运动过程进行模拟,以此对提出的改进界面处理算法进行数值考核.在此基础上,对聚能装药射流的形成过程进行数值模拟,模拟结果图像显示,其物质分界面清晰,并与实验结果吻合较好,从而验证了该方法的精度及有效性.

Interface Reconstruction Algorithm in Eulerian Multi-material Hydrodynamic Numerical Method

We develop a modified Youngs interface reconstruction algorithm for Eulerian multi-material hydrodynamic numerical methods.In the algorithm,the material's volume fractions of surrounding cells are used not only to calculate position of the interface but also to determine the transportation priority of materials.In a two dimensional multi-material Eulerian hydrocode MMIC-2D, the algorithm is employed and validated in simulation of a cirque moving in a translational flow field in two dimensional Descartes coordinates.In the simulation of jet formation of shaped charge,material interfaces are clearly shown and agree well with experimental results.It demonstrates accuracy and efficiency of the modified Youngs interface reconstruction algorithm.