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mixing of fluid at mating wall

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Old   August 8, 2022, 17:27
Default mixing of fluid at mating wall
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I am working on the interdigitated flow channel, where mating surfaces (internal) are supposed to diffuse the liquids from one side to the other. I experimented with different boundary conditions: internal as internal, which led to merging the surfaces and making a single entity. Additionally, I made internal as wall, which prevented the liquids to cross and do diffusion is observed . I am intended to observe diffusion at mating surfaces. Could you please suggest a suitable boundary condition?
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