Reply To: Correct CFX Pre Setup to avoid isolated fluid regions

[Mark Owens]

If your internal region is entirely surrounded by faces with a mix of walls, inlets and outets then you will still get an isolated region error because nothing that is happening outside will have any effect on what is happening inside.

 

What is the driver of the flow through the mussel? If it is coming from the external flow solution then there is nothing to do except not set walls on faces you want the flow to pass through.

 

If the flow being driven through the mussel is not coming from the external boundary conditions but something internal to the mussel, then you have two options

 

(1) Do not mesh the mussel. The inlet to the (non-meshed) mussel region is an outlet for the exterior region with a specified mass flow. The outlet from the (non-meshed) mussel is an inlet to the exterior region with the same mass flow.

 

(2) mesh the mussel region and add a momentum source somewhere inside the mussel region that is simulating whatever it is that is driving the flow through the mussel.