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Modelling a Flow across a boundary

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Hi guys,

I'm dealing with a flow across a boundary problem, as visualized in the picture below. The geometry consists of 2 rectangles, 1 for each zone. Both use Transport of Diluted Species.

One of the species will diffuse from zone 2 to zone 1.

To model this, I added a Negative Flux term, at the boundary of zone 2, and added another flux term at the boundary of Zone 1, Positive Flux term. But I am unable to get convergence of solution.

Is there anything wrong with this implementation?


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