Strange results when combining Induction Heating and Laminar Flow

I'm working on an inductor model in induction heating with cooling via laminar flow. I have tried exciting the inductor in two ways: via Lumped ports and Surface currents. The cooling is room-temperature air (20 degC) with an air velocity of 1 m/s. The box that confines the inductor is 0.75 x 0.75 x 0.75 m³

For the Lumped port case without cooling I get a maximum temperature of 900 degC. With cooling the result is 888 degC which I find is logical. Both cases are excited with the same voltage.

For the Surface current case without any cooling I get a max temp of 883 degC (SC_no_cooling.mph attached below). After that i implement the cooling in exactly the same way as for the lumped port case, but now the temperature RISES to 910 degC (SC_1.mph).

I also tried a different way of doing the multiphysics coupling by implementing "Heat transfer in fluids", and the results I get is a max temp of only 92 degC (SC_2.mph). All three models have the same surface current excitation.

My question now is, is any of the Surface Current models with the cooling realistic? If no, how can I improve the results? My opinion is that they aren't realistic at all but I would still like for them to work although my models with the Lumped ports are working.

Best regards
Bilal