Boat impact / Point Loading

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Simon.Wiedemann
Posts: 70
Joined: Mon Jan 09, 2017 1:00 am
Organization: Ruhr-Uni Bochum
Location: Germany - Bochum

Boat impact / Point Loading

Postby Simon.Wiedemann » Fri Jun 28, 2019 7:01 am

Hi there,

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,

Simon

Jason.Jonkman
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Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Boat impact / Point Loading

Postby Jason.Jonkman » Fri Jun 28, 2019 3:59 pm

Dear Simon,

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:

Code: Select all

m%F_PtfmAdd = p%AddF0 - matmul(p%AddCLin, q) - matmul(p%AddBLin, qdot) - matmul(p%AddBQuad, qdotsq)

to

Code: Select all

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).

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
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