Huge difference in Hybrid vs Conservative values in BC
 

Hello, I'm getting a huge difference between the values of pressure in my Boundary Condition calculated by the Hybrid and Conservative methods. I know the difference between them, however I would expect both methods to provide values within certain range. Instead of that I'm getting 0.629 bar in the outlet for the Hybrid method (which is my actual BC), and rouhly 2 bar for the conservative method. Is this a sign that my mesh is not refined enough? I know for a fact that there's a significant pressure gradient at the outlet of my domain.

Best regards.

If there is a significant pressure gradient at your outlet BC, and if the solution is well converged, I'd go with the conservative value because it is a part of solution while the hybrid is just your wish.

Hybrid and conservative values are only different in the volume adjacent to the wall. If you get such large differences between hybrid and conservative it suggests the volumes adjacent to the wall are a large proportion of the total boundary. This does not sound like a sufficiently fine mesh to me. But to be sure you should do a mesh sensitivity check.