The simulation aborts again, with a following errormessage:
- Maximum number of iterations exceeded when calculating temperature from a thermodynamic potential. This may be caused by low-quality mesh producing unrealistic pressure in a few cells or inappropriate boundary conditions, fluid properties or time step. Inspect fields for large values in the last time step.
Now I am not sure, what I am doing wrong. I have created the finest mesh I could. I have set the two holes in the box to natural convection inlet/outlet with 22.5°C, set the temperature inside the box to 22.5°, set the fans inside to momentum sources with (hopefully the correct axis), I have assigned the fluids and solids.
is the model just too complex and I need to increase the maximum runtime? it says that I need 80 core hours for the run. and actually, I just want to test if I have set up everything correctly 
Thanks and cheers
Mav