Entropy stable discontinuous Galerkin method for two-dimensional Euler equations

A two-dimensional version of the conservative entropy stable discontinuous Galerkin method for the Euler equations is proposed in the variables: density, momentum density and pressure. For the equation describing the dynamics of the mean pressure in a finite element, the approximation is constructed that is conservative in total energy. The special slope limiter ensures the fulfillment of the entropy inequality and the two-dimensional analogue of the monotonicity conditions for the numerical solution. The developed method is tested on some model gasdynamic problems.