How to define BC for internal layers

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To define the temperature at the common surface of two cylinders in COMSOL, users need to access the Physics settings and check the "mark the interior boundaries" option. This action activates the middle surface for boundary condition (BC) definitions. After enabling this feature, users can successfully set the desired temperature BC on the common surface. This approach allows for accurate modeling of thermal interactions between the cylinders. Properly configuring the boundary conditions is essential for effective simulation results.
kamran46
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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.
 
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go to Physics->Boundary setting->mark the interior boundaries checkbox.
and then you can set BC.
 
Thank you very much.
 

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