Dear All,

I have been working with acoustic porous media and would like to extend my 
script to deal with two-layered acoustic absorbers, in this case I am 
interested in adding an elastic layer on top of my porous media.

I took the step-46 as an example for matching two physical domains, 
everything works fine, apart from the interface boundary condition. In my 
case I need to strongly enforce the continuity of the solid displacement 
vector. In other words I need to set the solid displacements on the 
poro-elastic interface equal to the displacements of the poroelastic media 
on the same interface.

Would you please give me a hint on how it can be best done? Would the 
"constraints.add_line" function be still any help in this case? 

Thank you a lot!

Kind regards,
Mariia 

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