  The 10 and 14-moment maximum-entropy methods are applied to the study of
high-Mach-number non-reacting crossflows past a flat plate at large degrees of
rarefaction. The moment solutions are compared to particle-based kinetic
solutions, showing a varying degree of accuracy. At a Knudsen number of 0.1,
the 10-moment method is able to reproduce the shock layer, while it fails to
predict the low-density wake region, due to the lack of a heat flux.
Conversely, the 14-moment method results in accurate predictions of both
regions. At a Knudsen number of 1, the 10-moment method produces unphysical
results in both the shock layer and in the wake. The 14-moment method also
shows a reduced accuracy, but manages to predict a reasonable shock region,
free of unphysical sub-shocks, and in qualitative agreement with the kinetic
solution. Accuracy is partially lost in the wake, where the 14-moment method
predicts a thin unphysical high-density layer, concentrated on the centreline.
An analysis of the velocity distribution functions (VDF) indicates strongly
non-Maxwellian shapes, and the presence of distinct particle populations, in
the wake, crossing each other at the centreline. The particle-based and the
14-moment method VDFs are in qualitative agreement.
