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Hello guys,

I´m trying to run a premixed combustion. But I have following problem: I dont understand what the "unburnt gas" setting mean?
In my case I want to inject 100% CH4(=fuel). That means, that the initial fuel fraction has to be 0% or something near 0%.
Now if I set CH4=1 in the "unburnt gas" setting (because I think here I set the fuel composition) my screen shows me, that my chamber is filled with CH4=1. Why does the fuel mass fraction shows me a different picture than the mass fraction of CH4?

Can somebody explain to me, what this Fluid Stream Manager>"unburnt gas" setting mean and also how I can fix my simulation?
I´m glad about every suggestion?