Biborka Boga

Thank you very much your response and the explanation regarding to the inlet diffusion (theory).

I have checked whether this option was enabled or not by  typing in the console: ''define/models/species/inlet-diffusion?'' And the ''response'' to this was Include diffusion at inlets [no], so it seems that it was disabled. Unfortunately I have obtained the same concentration profile of O2.
The operating pressure 1 atm (Fluid Cell Zone).

Please find also below the absolute pressure of the mixture.


Can you please offer me some other hints whIch could be other potential  cause of this erroneous O2 conc profile? Thank you very much in advance!