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The 10 and 14-moment maximum-entropy methods are applied to the study ofhigh-Mach-number non-reacting crossflows past a flat plate at large degrees ofrarefaction. The moment solutions are compared to particle-based kineticsolutions, 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 topredict the low-density wake region, due to the lack of a heat flux.Conversely, the 14-moment method results in accurate predictions of bothregions. At a Knudsen number of 1, the 10-moment method produces unphysicalresults in both the shock layer and in the wake. The 14-moment method alsoshows a reduced accuracy, but manages to predict a reasonable shock region,free of unphysical sub-shocks, and in qualitative agreement with the kineticsolution. Accuracy is partially lost in the wake, where the 14-moment methodpredicts a thin unphysical high-density layer, concentrated on the centreline.An analysis of the velocity distribution functions (VDF) indicates stronglynon-Maxwellian shapes, and the presence of distinct particle populations, inthe wake, crossing each other at the centreline. The particle-based and the14-moment method VDFs are in qualitative agreement.

Modelling high-Mach-number rarefied crossflows past a flat plate using the maximum-entropy moment method