Existence of energy-variational solutions to hyperbolic conservation laws

Eiter, Thomas; Lasarzik, Robert

doi:10.20347/WIAS.PREPRINT.2974

PreprintAll rights reserved2022Published

Existence of energy-variational solutions to hyperbolic conservation laws

We produce the concept of energy-variational solutions for hyperbolic conservation laws. Intrinsically, these energy-variational solutions fulfill the weak-strong uniqueness principle and the semi-flow property, and the set of solutions is convex and weakly-star closed. The existence of energy-variational solutions is proven via a suitable time-discretization scheme under certain assumptions. This general result yields existence of energy-variational solutions to the magnetohydrodynamical equations for ideal incompressible fluids and to the Euler equations in both the incompressible and the compressible case. Moreover, we show that energy-variational solutions to the Euler equations coincide with dissipative weak solutions.