Unphysical mixing

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Hello everyone, I am getting unphysical mixing in a steady -state analysis, Transport of Diluted Species (TDS) model coupled with Laminar Flow. This exact same setup ran perfectly fine in COMSOL v6.2, but the issue occurs in v6.4. How can I adjust the settings in v6.4 to eliminate this unphysical mixing and get back my v6.2 results?


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