[All][Core][Model] CreateModelPart new behavior #9598
Merged
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📝 Description
As it has been discussed in #9258, the creation of model parts must happen at the modelers stage in order to enable the multistage simulation (not at the solver instantiation as we're doing right now).
Changing the
CreateModelPart
method of theModel
as suggested in here will ease the transition period. Long story short, right now we were throwing an error if the model part was already existing. With this change we will issue a warning and return the already existing model part.Backwards compatibility is ensured as we were throwing an error so far.