A Smoothness Indicator for Adaptive Algorithms for Hyperbolic Systems

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Shock detection and limiting with discontinuous Galerkin methods for hyperbolic conservation laws (2004, background): “[23] suggested a related indicator based on the weak local truncation error analysis of a central-upwind scheme.”
On the Reduction of Numerical Dissipation in Central-Upwind Schemes (2007, background): “This example, taken from [9], has a numerical “flavor” of an acoustic wave, propagating through a steady discontinuous flow field.”