Discussion Forum

Hello all,

I have an issue in defining the boundary condition. This boundary condition depends on a variable. The amount of this variable depends on the amount of the boundary condition.

COMSOL gives the following error: "Circular variable dependency detected".


Here is more information:
I am simulating moisture and heat transfer in porous media. To calculate the sensible heat flux at the boundary, I need to know the amount of sensible heat flux first to obtain the stability correction factor (Monin_Obukhov's parameter), and then using that parameter to obtain the corrected sensible heat flux at the boundary.

here is what I need to do:
1 - assume a value for stability correction factor
2- calculate the sensible heat flux
3- update the stability correction factor
this iterative procedure continues until the solution for sensible heat flux converged.

Any idea that how I should implement this in COMSOL.

By the way, apparently there is a discussion in COMSOL (i.e., Solution Number: 1215), but I do not have access to the COMSOL support.

Thanks,