  High order entropy stable schemes provide improved robustness for
computational simulations of fluid flows. However, additional stabilization and
positivity preserving limiting can still be required for variable-density flows
with under-resolved features. We demonstrate numerically that entropy stable DG
methods which incorporate an "entropy projection" are less likely to require
additional limiting to retain positivity for certain types of flows. We
conclude by investigating potential explanations for this observed improvement
in robustness.
