基于MVPPM的流固耦合方法在爆炸容器数值计算中的应用

Application of the MVPPM-Based Fluid-Solid Coupling Method to the Explosion Vessel Simulations

爆炸容器内部流场演化和壳体结构动力响应可为容器外形、结构和材料选取等设计提供直接的数据支持,但由于爆炸容器具有大尺度、多组分、高密度比和复杂结构等特点,其内部流场数值预测一直以来都比较困难。基于Level Set方法,将具有大变形特点的内部气体流场和相对变形较小的容器结构分离开来,对气体流场和容器结构分别采用Euler型的MVPPM方法和Lagrange方法进行处理,引入虚拟流体技术处理交界面上的物理信息,成功将这种流固耦合数值方法应用于椭球封头和类球形爆炸容器的数值计算。

The flow field evolvements inside the explosion vessel volume and the dynamic response of the vessel shell are basic data in designing of the vessel shape,structure and material selection. But for some reason of the vessel large scale, multi-component, high-density ratio and complex structure, and thus the numerical simulation of explosion flow field inside the vessel is very difficult. In this study, we ultilized the level set method differentiate the large deformation of the flow field from the small deformation of the vessel, and the Euler MVPPM method and Lagrange were respectively used in numerical calculations. The ghost fluid technology was employed to deal with the fluid and solid at the interface of the physical information. We successfully applied the present method to the ellipsoidal head and the similar spherical explosion vessel simulations.