N2 mass fraction increase during the combustion
I am simulating a spark-ignition engine with the flamelets libraries for hydrogen and methane. I complete the both simulations, but the methane's simulation shows an increase in the mass fraction of N2 when the spark is released. I tried different models of NO formation, increase the time step, refine the mesh, but the same problem persists.
I would like to know if any one already had this kind of problem and if anyone has some idea about what is happening.
Thanks for your attention!
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