Mike Pettit
Ansys Employee
Hi @AndreaMatteo,
Sorry you haven't received a reply to this sooner - the Forum has been undergoing some updates recently.
To answer your questions: in this case the method in 2b) is the best option for estimating the joint forces/moments between the two halves of the structure, and your modelling approach is correct. The errors that you see in 2a) are related to the calculation of the waterline integral, which is required for drift forces/QTFs.
I hope this helps.
Mike
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