How to define BC for internal layers

[kamran46]

Hi all,

I am new to this forum and COMSOL. I want to define the temperature at the common surface of two cylinders in contact. When I model the cylinders, the common surface (middle surface) is not active for defining any BC. Please tell me how can I do this in COMSOL. Thanks.

 

[GT1]

go to Physics->Boundary setting->mark the interior boundaries checkbox.
and then you can set BC.

 

[kamran46]

Thank you very much.