How to define BC for internal layers

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SUMMARY

The discussion focuses on defining boundary conditions (BC) for the common surface of two cylinders in COMSOL Multiphysics. The user encountered an issue where the middle surface was inactive for BC definition. The solution provided involves navigating to the Physics menu, selecting Boundary settings, and marking the interior boundaries checkbox to enable BC configuration. This method effectively resolves the user's problem in setting temperature at the interface.

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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.
 
Last edited:
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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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