[mahderezvan]

Hi guys. I have a problem with fluent and I need some help.
As can be seen in attached photo, I have two box which are attached to each other. Cold water and hot water flows through upper and lower box respectively. The body of box is from aluminum. left and right side of both boxes are symmetry.
Because in real geometry I have several of these boxes on top and down (hot,cold,hot,cold,...) I need to use periodic boundary condition for top and bottom surfaces. As I found I should define them interface in gambit and then in fluent from "mesh interface", select "coupled". So top and bottom surfaces should be attached to each other and have same temperature profile. But it didn't work and I don't know why?!!!
Could you please help me? I just need to connect the top and bottom faces thermally (we don't have any fluid flow there).
Thank you guys.

[AlexanderZ]

Hello
Try to use periodic boundary condition on the wall surfaces

Best regards

[LuckyTran]

Originally Posted by mahderezvan

(hot,cold,hot,cold,...) I need to use periodic boundary condition for top and bottom surfaces. As I found I should define them interface in gambit and then in fluent from "mesh interface", select "coupled".

I think these instructions are for how to make a coupled interface, i.e. coincident walls in thermal contact. They are not for making connections between disjoint boundaries.


Define your periodic boundaries as walls (or anything) in gambit.
Make them periodic in Fluent.

you can do /define/boundary-condition/make-periodic blah blah blah