Hi Ghislian,
There is no known issue with mass conservation.
Reaction Kinetics only dictates the rate of formation of species.
In the plot, the mass corresponds to the total mass within the closed domain ?
I'm assuming you have only 1 cell zone and the mass is reported as Volume intergral report.Â
Also, I'm assuming you are running it as Transient and the domain is a premixed system of your reactant species ( I see a mention of CH4, but there is an oxidizer also rt ?). Plus patching the entire domain to high temp of 2400K could trigger the reaction in the complete domain and could pose challenges in the simulation run.
In Summary, I would require details based on my above comments to assist your further.
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