Chaobergin气体多维模型中三角洲激波和接触间断的非唯一性
Non-uniqueness of delta shocks and contact discontinuities in the multi-dimensional model of Chaplygin gas
摘要：
本文研究了二维等熵可压缩Euler方程组的黎曼问题，其中压力定律描述的是Chaubergin气体。众所周知，对于某些Riemann初值，一维黎曼问题没有经典的$BV$解，而是出现了$δ$ -激波，它可以看作是密度分量中含有浓度测度的广义测度值解.证明了在二维空间中，从相同的初值出发，存在无穷多个有界容许弱解。此外，我们还显示了相同的属性的初始数据的一个子集，经典的一维黎曼解由两个接触不连续。作为后一个结果的结果，我们观察到，任何标准的基础上的原则，最大的能量耗散将不会选择经典的一维解决方案的物理。
英文摘要：
We study the Riemann problem for the isentropic compressible Euler equations in two space dimensions with the pressure law describing the Chaplygin gas. It is well known that there are Riemann initial data for which the 1D Riemann problem does not have a classical $BV$ solution, instead a $δ$-shock appears, which can be viewed as a generalized measure-valued solution with a concentration measure in the density component. We prove that in the case of two space dimensions there exists infinitely many bounded admissible weak solutions starting from the same initial data. Moreover, we show the same property also for a subset of initial data for which the classical 1D Riemann solution consists of two contact discontinuities. As a consequence of the latter result we observe that any criterion based on the principle of maximal dissipation of energy will not pick the classical 1D solution as the physical one.
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