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It would be two runs, right? I mean in this case, you need to run your model to a certain point and then use you current condition as initial condition for you next run using desired BC.

It is not automated in a single run! true?

Is it possible to apply a condition in the middle of the analysis? Imaging that one applied the load and they wanna tell the code to add something to the domain at t=4s.

Got it. I think your mistake is that you apply the wrong force on the boundary of small model. You should apply the response that you get from the first model minus the reflection from the surface of first model. Imagine that there is no structure, the final stress ( or force) at point i,j is the st...

Hey KyriakosTryphonos,

I am not sure if I understand your question correctly. In the second step, you are applying the response at the boundaries of smaller model, right?
Please help me understand your problem then we can work on it.