[Scotty]

Hey all,

I have a pipe, and in this pipe there is a grid of thin surfaces going down it. In Designmodeler, I use a 'fill' on this pipe to get the fluid domain and I have the surface body of the thin grid.

I have my wall as a named selection/boundary condition, and the grid as a separate one. After meshing it in Ansys mesher and bringing it into Fluent, the thin surfaces are not there in the boundary condition list.

If I set the physics preference to mechanical in the mesher, then Fluent sees them, although I am not doing mechanical .

The only way I've managed to do thin surfaces in the past are through some slicing options, e.g. here I could keep slicing by various planes at different offsets to make a grid of fluid volumes, put a named selection on the internal faces, then it recognises it. This way seems tedious and somewhat eccentric however, and there must be an easier way.

Thank you for your help.

[Scotty]

Solved. Spoke to Ansys, bug in the slightly older version I am using!