Doubts on butterfly

Dear Community,

I am simulating a natural ventilation with both external and internal flow for building. can you please help me with the following questions:

  1. how to define natural opening at inlet i.e pressure inlet.
  2. how to define interior for the face which open to atmosphere of the building.
  3. how to define symmetry boundary condition for the bounding box covering the building.

I would highly appreciate if any one can help me in this. thanks in advance,

warm regards,
D. Rajasekhar.

Have you seen the custom boundary component?