stoopid discontinuity

Matthew R

Hi all, i'm quite the novice at CFD. I've used Gambit to generate my mesh but i have a really frustrating problem. When i import the mesh to Fluent and run a few iterations i see that flow does not occur across the boundarys of different volumes. ie flow goes into one section and stops as if it thinks it is a solid wall. For the life of me i can't determine how to fix this! I don't think i need to Fuse in Fluent. Strangely, if i do a little test in a new file with 2 simple volumes with different meshing and run it in Fluent this type of discontinuity doesn't exist, so why in my big mesh? It is very very frustrating...

Regards, Matt