[fruitkiwi]

Dear all,

I am simulating the flow in a simple 2D rectangular and I would like to set the periodic condition on an interior line in fluent.

However, I am facing problem in selecting the interior line as boundary condition.

Attached is my geometry picture. Even I tried to draw the line in the middle, however, when I select "surface from sketch" to generate the surface, the interior line disappear and it do not appear in the Meshing. May I know how can I keep the interior line appear in the geometry? so that I can mesh the model and import the model into fluent with an interior line inside to be used as boundary condition.

Thanks.

interior line.jpg