Sorry for the late reply.
I have tried both incompressible and weakly compressible.
After the error occurred i do get a result but i think it is questionable how much i can rely on that.
The errors i get are:
Failed to find a solution:
No convergence, even when using the minimum damping...
I'm making a model in Comsol.
In it air streams from a pressure chamber through a small jet (1 mm).
It seems i am having problems with it because i can't get the tolerance or getting different errors.
I have revined the mesh as much as the computer can handle but i stil don't make it.
Is...