i try to figure out how to incorperate a boat impact load case for an offshore wind turbine.
i) is there any possibility to include a single force dependent on time at water line?
ii) If no, would it be feasible to misuse icedyn or icefloe in order to include such a force?
Thank you and best regards,
To simulate boat-impact loads or a user-specified time-dependent force at the water line in FAST / OpenFAST will require a small customization of the source code. I wouldn’t bother with trying to use IceDyn or IceFloe for this. For example, you could modify SUBROUTINE HydroDyn.f90/HydroDyn_CalcOutput() so that you add a force to the existing additional platform load i.e. change:
m%F_PtfmAdd = p%AddF0 - matmul(p%AddCLin, q) - matmul(p%AddBLin, qdot) - matmul(p%AddBQuad, qdotsq)
m%F_PtfmAdd = p%AddF0 - matmul(p%AddCLin, q) - matmul(p%AddBLin, qdot) - matmul(p%AddBQuad, qdotsq) + XXX
where XXX is your user-specified time-dependent function in six DOF (3 forces, 3 moments, as a vector).