Hi,
So I am trying to perform flow simulation and I keep getting the error "Face<1> is not laying on the boundary between solid and fluid region."
This is what my model looks like, I have put lids on each end of the model, and I have increased the computational domain.
Any help would be appreciated.
Thanks 
Thanks Jerry
is this internal or external?
is there anything inside the tube that you're showing us?
when you set the comp domain to auto, does it look strange?
if you have a tube that has lids on the end, the only thing that would cause this type of issue is if there was a leak somewhere
I am interested in the internal flow conditions, the tube is hollow and has nothing inside it.
When i set the computational domain to auto it says "Face<1> is out of the computational domain" when I try to apply an inlet velocity to at the lid.
I think I may have solved my own problem.
When selecting the faces for the boundary conditions, I went "select other" and then chose the Lid body, I then deleted Face<1> as a selection.
I feel silly now haha
oops, yep, that is normally the easy one. glad you figured it out!
Luke,
You might get more, or better, responses if you move this to the Flow Simulation subspace. Move should be available to you under Actions to the right of the page.
Jerry S.