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Ansys Learning Forum Forums Discuss Simulation Fluids non-physical negative uds concentrations with small diffusion coefficient Reply To: non-physical negative uds concentrations with small diffusion coefficient

Rob
Forum Moderator

That looks like you're trying to move/remove material that's not present in the cell. Ie the sink isn't linked to cell content. With species it'll stop working as you can't have a negative volume fraction, but scalars don't have a check. 

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