Link Constraint for Non-Identical Regions

Dear all,

I hope this is the correct place to post a question like that.

I’ve been working in a combined 1D and 2D finite element (FE) model in GetDP with a magnetic field (H) formulation and I’d like to connect the intensity of magnetic field over an edge in 2D with the boundary of a 1D FE system (see figure below). For this purpose, I’ve created two independent “FunctionSpaces” and I tried to apply a constraint of type “Link” to connect the related Degrees of Freedom. However, as each edge in the 2D system is defined by two nodes, the elements in the 2D and 1D regions are not geometrically identical (edges in 2D and nodes in 1D) and I couldn’t apply this type of constraint directly.

Thus, I was wondering if there is any way to connect them using a constraint “Link”. Maybe with the optional “FunctionRef” function, but I couldn’t figure out how it works. If possible, could you please give me an example of the application of the “Link” with “FunctionRef”?

Thank you and best regards,

Bruno Alves