Fig. 3
Mach number distributions normalized by the maximum Mach number Mmax at t = 1 for the Gresho vortex test. The top and bottom rows show results computed by Apsara and Prometheus, respectively. Regardless of Mmax the vortex remains intact when simulated with Apsara, while with Prometheus the vortex gradually dissolves because of numerical dissipation as Mmax decreases.
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