Abstract
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 \(\delta \)-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 exist 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. In particular, not only the criterion based on comparing dissipation rates of total energy but also a stronger version based on comparing dissipation measures fails to pick the 1D solution.
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Acknowledgements
O. Kreml and V. Mácha were supported by the GAČR (Czech Science Foundation) project GJ17-01694Y in the general framework of RVO: 67985840. O. Kreml acknowledges the support of the Neuron Impuls Junior project 18/2016.
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Březina, J., Kreml, O. & Mácha, V. Non-uniqueness of delta shocks and contact discontinuities in the multi-dimensional model of Chaplygin gas. Nonlinear Differ. Equ. Appl. 28, 13 (2021). https://doi.org/10.1007/s00030-021-00672-0
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DOI: https://doi.org/10.1007/s00030-021-00672-0