Using beam elements for floating system mooring

Non-preCICE
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I want to use beam elements for the anchor chain, where the connection point between the anchor chain and the buoyancy body is the same point. Do I need to use MPC constraints? Or can I simply use the same point without constraints? How should I proceed?I attempted to define two connection points with identical coordinates and added MPC constraints, but why aren’t the Floating body and anchor chain connected?

1.inp (259.2 KB)

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@HHao-gihub I am not very familiar with CalculiX or with this type of coupling, but isn’t this a pure CalculiX question? In that case, better try asking directly in the CalculiX forum: https://calculix.discourse.group/

If this is about the coupling, could you please describe your case in more detail, including the coupling interface and exchanged values? A figure would help.