Hi!
Thank you for your reply. please see the image below. at the inlet the mole fraction of ammonia is 0.99 while after simulation the mole fraction of ammonia at the inlet is only 0.42. I have double checked numerous times and the same result comes.
second the under-relaxation factor for all species is also 1. I also checked using report definitions as area weighted average for the mole fraction of ammonia at the inlet and it gives the same result of 0.42. so the last thing I could think of was if the inlet could be estimated as upwind boundary condition.
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