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How to specify a mixture of gases at inlet boundary condition?

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Old   April 22, 2012, 14:16
Default How to specify a mixture of gases at inlet boundary condition?
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Andrius
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Hi guys,

I am trying to specify at inlet boundary conidtions that I have a mixture of gases entering the domain - x kg/s of methane and y kg/s of air, for example. However, I am only able to choose one gas for the inlet...

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Old   April 22, 2012, 23:29
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is it possible for you to split your inlet in two parts? so that you can enter both the fluid velocities.
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Old   April 24, 2012, 05:17
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Hi,

I'm not sure about this, but if you're using the VOF model, you should be able to specify the volume fraction of each phase at the inlet (if you have a velocity inlet, velocity is the same for the two phases so knowing the different densities you should be able to specify the flow rate).
Hope this can help,

Andrea
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Old   April 24, 2012, 06:08
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There are 2 ways. If it's a homogeneous mixture (no discrete phases) you can use the species transport model and define your mixture with mass fractions of individual components.
If it's a inhomogeneous mixture (discrete phases) then you can either use the Multiphase-->Mixture model or Multiphase-->VOF model and define the volume/mass fractions of your 2 phases at the inlet.

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Luke
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