Discussion Forum

Hi everyone,

I am using the physics builder interface make my own heat transfer mode and would like to include the emissivity for radiative heat loss. Everything works fine with my heat balance correctly accessing my materials (also with customized material groups) on the selected *domain*, except for the emissivity. The solver returns an error that it cannot find the parameter and, if I look at the materials node, I see that boundaries 1-4 require a material (despite the fact that the domain enclosed by these boundaries does have the material.

I saw a previous thread where Ivar commented:
" As by default in COMSOL the boundaries do NOT heritage the domain material properties, particularly because in "union" mode, you have a common boundary for two adjacent domains, so COMSOL cannot choose by itself which of the two materials to set on the common boundary between the two materials.
"

This makes sense to me (nicely pointed out!), but I wonder if there is an alternative to the default which may be enabled? There are a number of workarounds (the simplest of which being including the material again, this time on the boundaries) but it strikes me as sloppy.

Anyone have any suggestions?

Thanks!