Fail with a very basic 3d mesh


I just tried a very simple 3d steady-state thermal problem :

  • two solids, each has a specific thermal conductivity
  • two mixed boundary conditions for each thermal space has a specific conductance hi and an external temperature Ti, such the flux is : - lambda*dn(T) = hi.(Ti-T).

In my case, the two temperatures are 0°C and 20°C, and I do not understand why the temperature is completely wrong, going to -2883 to 5393 !

Is there something wrong in the msh file (the msh file comes from netgen mesher) ?

Best regards. (28.9 KB)