This paper focuses on the novel scheme to unify both Lagrangian staggered-grid and cell-centered hydrodynamic methods in one dimension. The scheme neither contains empirical parameters nor solves the Riemann problem. It includes two key points: one is the relationship between pressure and velocity, and the other is Newton's second law. The two methods that make use of this scheme satisfy the entropy condition and are conservative in total mass, momentum, and energy. Numerical results show the robustness and accuracy of both methods.
翻译:本文关注一种新颖的方案,将拉格朗日交错网格和以单元为中心的流体力学方法统一在一维内。该方案既不包含经验参数,又不解决黎曼问题。它包括两个关键点:一个是压力和速度之间的关系,另一个是牛顿第二定律。利用该方案的两种方法满足熵条件,并且在总质量、动量和能量上是守恒的。数值结果表明,两种方法都很稳健且准确。