[COMSOL_Users] order of magnitude problem, PDE, 1D geometry [5 Attachments]

[Michele Laiso]

Hi to everybody.
 
I am a new Italian Comsol user.
I’m using “Comsol 4.0a” and I’m trying to simulate a 1D problem with the “Coefficient form PDE” physics. The problem deals with the degradation of a composite exposed to a heat flux on a surface and protected by an insulator on the other five surfaces. The problem has two unknowns (temperature and density) on the first tract (composite) and one unknown (temperature) on the second one (insulator).
 
On the left point is applied a constant heat flux plus radiative and convective losses to the environment, whereas on the right point only the radiative and convective losses.
 
The output is seemingly correct, but the values of the integral calculated in post-processing is two order of magnitude smaller.
I cannot find the error. I think the error is due to some setting of the solver or the definition of the integral in pre- or post-processing.
Please help me.
 
The attached files contain the equations of the problem, the manipulations of their coefficients and the lists of material properties.
 
Thanks a lot.