Thank you, I will try that.
The proposed model is for a porous zone. Since the porous section is only 0.4 mm thick, I also tried to model as a porous jump where i simply used alpha=1/(4.75e11) m2 as face permeability. Pressure-Jump Coefficient and Thermal Contact Resistance as 0.
I can't get the model to converge this way, and I am having difficulties understanding what the problem is also here. If you are able to help me out, that would be great!