How to model mooring lines with a shared anchor point in OpenFAST (MoorDyn)?

[wufangyun92]

Hello,

I would like to ask whether it is possible to simulate a system in OpenFAST where multiple mooring lines share the same anchor point (i.e., the mooring lines are connected to a common fixed node on the seabed).

If this setup is supported, what kind of command or configuration should be added in MoorDyn to define such a shared anchor?
For instance, should I define multiple lines connected to the same node, or is there a specific keyword for this kind of configuration?

Thank you!

[jjonkman]

Dear @wufangyun92,

To model a shared anchor in MoorDyn, all you need to do is connect multiple lines to the same Fixed point; no special consideration is needed.

Best regards,

[wufangyun92]

Dear @jjonkman,

Is it possible to build multiple fans at once in OpenFast? How can I do it?

Best regards,

[jjonkman]

Dear @wufangyun92,

If you are referring to the modeling of multiple wind turbines in a wind farm, FAST.Farm--the wind farm extension of OpenFAST--is what you want.

If you are referring to the modeling of multiple wind turbines on the same support structure--i.e., multi-rotor functionality--we will be releasing that capability in OpenFAST in v5, coming soon.

Best regards,

[wufangyun92]

Dear @jjonkman ,

If I want to add turbines and shared moorings, can I simply copy the code? How should I modify the shared moorings?

Also, why were the initial displacement heights of the two turbines different initially? Will adding another turbine affect their initial positions?

Best regards,