how to count a number of super sonic point?
 

Hi,
I am calculating a nozzle. but, the continuity is decreased very rapidly, after 100 iteration it would be 10^-5. So, I think it is useless checking the continuity residual.
So, I want to check the number of supersonic point as convergence criterion.
However, I don't know how to count a number of supersonic point in FLUENT.
Please let me know how to set up to check the supersonic point!!!