[adele]

Hi,
I'm trying to model the heat transfer in a shell and tube heat exchanger and I'm using Fluent for this. To simplify the problem, and to reduce the time calculation, I cut the geometry in 6 in the length direction, and study just a 6th of the geometry. That is why my velocity inlet pipes (the small ones) are cut either in 2 or in 6 equal parts. You can see a picture of the geometry here.




However I want to insert a parabolic profile with a UDF in the 3 cut pipes by respecting the center of the paraboloid and the cut geometry.
My questions are:
- is it possible to define the three inlet faces of the pipes as three different velocity inlet faces, and to define a parabolic profile for each one? Or do I have to group the faces and write only one UDF for the velocity profile?
- Is it possible to insert a parabolic profile even if the tube is cut? I mean, without changing anything in the C code. If yes, how to define a different coordinate system origin for each one? I read somewhere that it's better when the system origin in the UDF is also the system origin in Fluent
Thank you in advance for the help!
Adele