Wall Shadow BC for convection
 

Hi

I can see this gets brought up alot in the forum but I havent quite found an answer to my problem whilst searching through.

I'm modelling (trying to) natural convection in a room that consists of two solid bodies. The shadow conditions have been created such that I have fluid-shadow-wall-interior. I can identify which BC is adjacent to the fluid and which is adjacent to the solid but I want to apply a convection Boco to the BC adjacent to the wall and effectively nothing to the other wall as i'm not interested in what happens there.

What options would I choose to achieve this, I have tried selecting interior for one of the BC but this gives me an error.

Any help greatly appreciated.

Billy