connecting Faces with different mesh intervalls

Franz

Hi

I'm trying to mesh a simple tube with a direction change at the end. For this reason the room where the air is redirected is outfitted with a finer mesh than in the other parts of the tube. Now the problem:

Cause of an UDF I want to jump from a mesh intervall of 5 to 1 at one face. the problem is that when I try to connect the faces one of the meshes is deleted and is it not possible to generat the favoured mesh intrval. It is now possible to generat an interface and import the mesh into fluent and connect it by the programm but due to a high amount of these interfaces I 'm looking for an easier way to sortout the problem .

Thanks for any help