多组份计算中封闭性模型研究

在使用单速度多组份方法计算多介质混合网格中的物理量时,需要给出一种封闭模型来使控制方程封闭。本文分析了压力增量相等封闭性模型存在基础遭到破坏的原因,之后在保证流场守恒性的前提下构造可以保证假设基础的可解方程组对压力增量相等封闭性模型进行修正,给出了一种改进方法。使用改进的模型进行了爆轰驱动飞片问题的计算,计算结果表明,改进的模型能很好的追踪物质界面和冲击波位置,同时较好的抑制界面处压力、内能震荡。

The closure model of multi-component simulation

The single-velocity and multi-component computing method of multi-fluid dynamic equations are not closed,so we should give out some closure models.In this paper,the closure model named "pressure increment equality" is described,and then we point out its strongpoints and limitations.Based on the pressure increment equality closure model,we give a betterment of it which is aimed at its limitations.By using new closure model,the explosion-drived problem was simulated,the results proved that new closure model can trace the material interface and the shock wave interface much exactly without the vibration on pressure and energy.