[Aldanu]

Good morning,
I have a problem when meshing a heat exchanger: since it is made of a tube in another tube, I should create an interface between them, but I have no idea how to do so. The best I could do is a couple of sketches, one for the Inner tube and one for the outer one, before creating two surfaces out of them and extruding them. Unfortunately this means I had to create two overlapping circumferences, perfectly identical, for the two surfaces. This gives problems because openfoam does not understand they are a single interface. Thank you in advance.

[Kapi]

can i suggest you to go thru tutorials before you ask questions here?

[oozcan]

Originally Posted by Aldanu

Good morning,
I have a problem when meshing a heat exchanger: since it is made of a tube in another tube, I should create an interface between them, but I have no idea how to do so. The best I could do is a couple of sketches, one for the Inner tube and one for the outer one, before creating two surfaces out of them and extruding them. Unfortunately this means I had to create two overlapping circumferences, perfectly identical, for the two surfaces. This gives problems because openfoam does not understand they are a single interface. Thank you in advance.

First,

You could do drawing in CAD software.(only fluid domains should be drawn)
Import to ANSYS-WORKBENCH Geometry named DesignModeler
All faces should be given named selection
Meshing properly to y+ ( y+=1 or y+>30)
Contact faces should be choosen in FLUENT mesh interfaces tab.
İt is not needed for perfect mesh between two contact surfaces/faces.
Shared topology is so critical in contact faces that you should select imprints