That paper doesn't appear to have much to do with what we're talking about here. The transfer of heat to the vehicle from the hot shocked gas is another issue entirely.
Anyway, it's foundational supersonic fluid physics that shocks create entropy.
Reentry with blunt bodies works because most of the dissipation is occurring at the shock, at some distance away from the vehicle, allowing most of the heat (that must be produced from the kinetic energy of the vehicle as it slows) to be carried away.
Anyway, it's foundational supersonic fluid physics that shocks create entropy.
"Shocks are irreversible occurrences in supersonic flows (i.e. the entropy increases)." -- https://en.wikipedia.org/wiki/Shock_(fluid_dynamics)
Reentry with blunt bodies works because most of the dissipation is occurring at the shock, at some distance away from the vehicle, allowing most of the heat (that must be produced from the kinetic energy of the vehicle as it slows) to be carried away.