“…These cases are modeled using a five species (N, O, N 2 , O 2 , and NO) chemical nonequilibrium, non-ionizing air chemistry model 6 . A radiative equilibrium wall temperature boundary condition is set at the surface, and Reaction Cured Glass (RCG) catalycity 7 are applied at the surface of the Orbiter tiles and the BLT protuberance. Both codes have been used extensively to predict aerothermal environments for the Space Shuttle as well as other Earth entry vehicles (e.g., Fire-II 8 , Apollo 9,10 , and Genesis 11,12 ).…”