Problem with gas inlet in an external flow
 

Hi everybody!

I'm working on a gas dispersion from a tube that is in a table. My problem is that the soft isn't recognizing the end of the tube as an inlet, even when I named so. I've tried to enclosure it; tried to name the table has a solid and the tube as fluid and then encloruse it; tried to build the environment without using enclosure, but at the end, in all of them, the fluent isn't seeing the surface has an inlet.
Just to know, the table has 70mx70m, 30m high and the tube has 0,2m of diameter.(the problem could be with the dimensions, because the diameter is too small??)

Does anyone know how to solve it??

Thanks!