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Boundary condition at outlet for progress variable

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Old   October 7, 2014, 10:53
Question Boundary condition at outlet for progress variable
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Hi everybody,
I have a doubt about defining the boundary condition at outlet for a progress variable in a non-premixed combustion simulation case.
Actually, my progress variable Y is defined as linear combination of 3 species mass fractions and it is implemented through a UDS transport equation.
I've set the outlet boundary as pressure-outlet. Since I've already set Y as constant for coflow and fuel BC (calculated respect to the species mass fractions values of these inlets), now i'm not sure about what kind of BC i need to choose for the oulet: since the 2 possibilities for UDS boundary conditions are SPECIFIED VALUE and SPECIFIED FLUX, which one could be more suitable for this kind of simulation?

I sincerely appreciate any kind of suggestion.
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boundary condition, pressure-outlet, progress variable, uds

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