[abdullahkarimi]

Hi guys,
I am trying to simulate air-fuel mixing in backward facing step....i m injecting hydrogen from bottom wall downstream the step. the injection condition is sonic and m using stagnation inlet in starccm+. The air inlet mach no. is 2. The problem diverges after some iterations. there is reverse flow at outlet sometimes.
plz comment on the probable cause of diverging.

thanks

Abdullah