Hey there!
A few remarks that can help you move forward with your simulation:
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In a steady state simulation, the ‘time’ is only used to iterate towards the final solution. Do not compare intermediate states, just final converged ones. Also, initial conditions should not make any difference here, besides helping the solver to converge in fewer iterations.
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If the mask is assigned as an advanced concept (porous zones in this case), then there are no walls there to apply boundary conditions.