thanks for the reply. I did the change to mesh with BL and now, as you already have verified, the results seems something sensible.
Some questions regarding the topic and your data:
1- I have had some experiences with difficult geometries in which is very difficult to pass the mesh quality checks if BL mesh is included. These “bad-cells” gave me some blowup numerical comvergence problems.
I also read somewhere that in flows where the pressure drop is caused fundametally by geometrical constraints or “obstacles”, the frictional component added by the walls was of lower importance, so I assumed it was of less importance to assure the y+ value near the wall, and use the BL mesh. So that´s why I did not use it in the first place.
Obviously I was wrong in this case, and for this case not using the layer mesh causes to get a “solution” where it seems two outlets are somewhat “shortcircuited” with a non physical ridicolous high flow.
Any comment/opinion on the previous is welcomed,
2- on respect to use a pressure inlet condition, Do you propose use two pressures as BCs? Usually for ventilation systems a flow is required, so it is the natural condition to start with. Once the pressure drop known, the fan or blower is selected to match it. It could be used also the custom "fancurve"custom BC, but not sure how.
3- what is exactly the last convergence graph shown and how have you got it?
thanks and regards