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Boundary conditions for CEL interaction (e.g. tie contact interfaces)

Boundary conditions for CEL interaction (e.g. tie contact interfaces)

Boundary conditions for CEL interaction (e.g. tie contact interfaces)

(OP)
I read through the Abaqus documentation looking for different boundary conditions supported for an eulerian mesh within a Coupled Eulerian Lagrangian simulation setup. I initially found information about inflow/outflow conditions and mesh boundaries in regards to the eulerian domain movement (e.g. the mesh can follow the surface). These are NOT the BCs I am looking for. Instead I want to create boundary conditions connecting some parts of the lagrangian model to the euler material/nodes. I am aware that there are many restrictions for this, but I thing this it should generally be possible. In the Abaqus documentation section "14.1.1 Eulerian Analysis" in the paragraph about "Limitations" it states:

(1) Boundary conditions: You cannot apply prescribed nonzero displacement boundary conditions to Eulerian nodes.
(2) Lagrangian attachments: You cannot attach Lagrangian elements to Eulerian nodes. Use tied contact interfaces instead.
(3) Constraints: You cannot apply Lagrangian constraints (MPCs, etc.) to Eulerian nodes. Use tied contact interfaces instead.

Essentially, I want to accomplish (2), but I have no idea how to do use these tied contact interfaces for CEL and any help, guidance or example would very much be appreciated if you know how to setup such an example.

For my use case, imagine I have a circular lagrangian surface and would like to attach a half-spherical (eulerian) object in its center. I would like this object to stay attached to the base when it deforms (see screenshot). In lagrangian space I could simply tie them together with some constraints, but how do you do that within CEL?

PS: attached a basic lagrangian example of what I am imagining

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