I have imported the GRI 3.0 chemical mechanism to Fluent. I am using it for combustion study in a small 3D geometry. The mechanism GRI includes 53 species. At moment I do not have any nitrogen at inlet boundaries where I set the inlet velocities and species. Therefore I expect that the model should not calculate those species that include nitrogen atom (hnco, cn, n2, no, no2,..). But now that the model is running I can see that residuals for these species are also being reported and calculated which is strange and they supposed to be 0, even if they being reported.
Why it is like that?
Here is how I have set my Species Model:
and as I mentioned above, N2 is not included in the inlets, so it supposed to be neglected, but now it it is produced in the model.
Appreciate your help in advance,