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Permeating problem Boundary condition

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Old   October 31, 2015, 12:49
Question Permeating problem Boundary condition
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Xuekun Lu
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Could anyone tell me what boundary conditions should I use in the unsteady permeability problem? It is a multi-channel system with complicated bends. I want to know the final mass distribution of the gas.

How shall I define the outlet boundary condition? I don't know the final pressure, nor velocity, nor mass flux at any outlet of the modelling structure, and these are what I want to find out from the simulation.

I know there is "flow outlet" in fluent, which seems suitable for my case. But I am using Star ccm, here is what I can only choose for the outlet, which one is the most correct one?

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boundary condition, diffusion-type, outlet boundary, permeable

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