Hey everyone, I have a similar problem to this post: Solution Diverged - Bad Elements but I just can’t seem to find the problem in my model? I have tried everything from moving my “fan” away from the wall to mesh refinements and changing the relaxation. Anyone has any suggestions?
Tagging @Retsam as well as @DaleKramer here. Andrzej, I think you worked on the coanda effect in the past and can give our user some useful tips on the issue? 
Cheers and take care!
Jousef
@rishi_kumar: that project has nothing related to Coanda effect.
The problem is possibly linked to putting air into closed room, with no outlet for flow.
I suggest to replace your ‘fan’ with ‘momentum source’: You need to define a geometry of the size of your fan (a cylinder, suspended below your ceiling, not touching the ceiling) and use Advanced concepts > Momentum sources.
Take care,
Retsam
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