> Well, I guess you could search for all support points of enriched DoFs 
> that lie outside of your domain of interest and add a homogeneous 
> constraint for them to the AffineConstraints object. The 
> DoFTools::map_dofs_to_support_points 
> <https://www.dealii.org/9.0.0/doxygen/deal.II/namespaceDoFTools.html#a10af6ba7adc43214e7b9f6815588f2aa>
>  and DoFTools::map_support_points_to_dofs 
> <https://www.dealii.org/9.0.0/doxygen/deal.II/namespaceDoFTools.html#aec064dac51c8f66b7aa2a7747641584f>
>  functions 
> may be of some use.
>
> Thanks, I'll try that.

By the way, have you looked at the FE_Enriched 
> <https://www.dealii.org/9.0.0/doxygen/deal.II/classFE__Enriched.html> class? 
> It seems to me like its built for applications similar to this one.
>

I started with the code published in 
https://journals.ub.uni-heidelberg.de/index.php/ans/article/view/22317 and
adopted it for my problem. Since you had removed Step-47 tutorial it is 
hard to figure out how to use FE_Enriched class.
So using FE_Enriched will be my next step.

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