[alavar]

Hi All,

I define a gas mixture consisting of, let say, three species 'a','b', and 'c'. When I want t assign boundary conditions, under species-tab, by default, I am given options to set mass fration of only 'a' and 'b'. But I want to be able to assign the mass fraction for the other element ('c'). What am I missing?

Thanks,
A

[coglione]

Keep in mind that all mass fractions must sum up to 1.
After some sophisticated mathematics the equation a+b+c=1 will give you the right answer.

cheers

[idil]

the last specie in the mixture list you assign should be the bulk specie. you cannot specify the mass fraction of the last one it computes automatically.