Dear Kasia,
The BModes input file we have provided for the OC3-Hyind spar includes the 6x6 added mass matrix, the 6x6 hydrostatic stiffness matrix (augmented with the pitch and roll restoring from body weight / gravity), and the 6x6 mooring stiffness matrix–see the following forum post: BModes : Input parameters about tower support subsystem - #2 by Jason.Jonkman. (Please note that the link to BModes_JJ.exe and the OC3Hywind.bmi input file is now: drive.google.com/drive/folders/ … sp=sharing.)
The full-system mass, center of mass, and inertia of the rigid NREL 5-MW baseline wind turbine atop the OC3-Hywind spar is given in the following forum topic: Inertial Moments of OC3-Hywind Components - #2 by Jason.Jonkman.
Best regards,