Theory for the Interior Fan Boundary Condition
When the Reacting Flow multiphysics coupling feature is active, the mass fraction fields that are discontinuous over the fan. For each species, ωi, an outlet mass fraction condition is applied:
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If direction is Along normal vector, the outlet mass fraction ωi, avg is defined by
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If the direction is opposite to normal vector, the outlet temperature Tavg is defined by
This means that there is no diffusion over the interior fan, and no migration either.