Why is a species appearing in the flow without an inlet?
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I am modeling diffusion of dissolved oxygen and liquid water across a thin membrane between two channels experiencing parallel flow.
Each wall has zero diffusive flux, but water is appearing within the channel and oxygen is disappearing. I have run the simulation for 1000 iterations, and it appears as though this is not an aberration of low iteration number.
What could be a cause of this non-physical appearance of a species in the channel? There are no other species other than oxygen and liquid water, and reactions are turned off.
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