What happens if you run the problem as a transient problem and you slowly ramp up the velocity?
that is 26,000 km/hr or so. That is like Mach 25 or so. The program does not support flows much above Mach 5. The code does not support the dissociation of gases to plasmas in any event.
You are trying to calculate 21M-22ach speed. Flow can only calculate to 5Mach then you get DISSOCIATION of molecules. You need to lower your speed or ask NASA what software they use. If you will get solution faild below 5Mach speed try to setup transcient study with speed grovin up untill 5Mach.