James,

I do find it interesting that the two meshes were not imported with the 
> same boundary IDs. I guess in the future I should assume that all boundary 
> IDs are zero and reset them for each calculation? Also, is there a quick 
> reference guide for what each boundary ID means? I have not yet found such 
> a reference on the deal.ii website.
>

There is no global meaning for any boundary id. Every code can decide what 
to do for faces with a specific boundary id. Have a look, e.g., where 
interpolate_boundary_values is called and have a look at the first tutorial 
steps, in particular step-3.

Best,
Daniel

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