Questions related to (i) SSI, (ii) mooring lines types and (iii) coupling OpenFAST with Abaqus or OpenSees

Wind & Water Computer-Aided Engineering Software Tools
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Dear @Riad.Elhamoud,

Here are my responses to your questions:

  1. NREL has not supported such couplings. These topics have been discussed within the OpenFAST user community, but I’m not aware of a public repository where such a coupling has been shared. I’m sure developing a direct time-step-by-time-step coupling between OpenFAST and Abaqus or OpenSees is possible, but that it would likely take a lot of work to implement. I’d be surprised if Abaqus or OpenSees would only need displacement from OpenFAST; I would suspect they would also need velocity (and perhaps acceleration, depending on if the loads returned to OpenFAST include added-mass-type effects).

  2. I know that we used both semi-taut and taut-line mooring systems in variations of the IEA Wind 15-MW reference wind turbine atop the VolturnUS submersible in the following paper currently under review in the Wind Energy Science journal: WESD - Sensitivity analysis of numerical modeling input parameters on floating offshore wind turbine loads in extreme idling conditions, but I’m not sure how to access the publication cited. I will ask others to respond.

  3. / 4. As I mentioned recently in the following forum topic: Onshore wind turbine: modeling of nonlinear foundation - #49 by Jason.Jonkman, NREL is aware of the development of FoundDyn, but it was not developed by NREL and was developed in parallel to NREL’s SoilDyn module. SoilDyn has been been developed by NREL for SSI under the following pull request: SoilDyn -- soil dynamics module by andrew-platt · Pull Request #986 · OpenFAST/openfast · GitHub, which is slated for merging in OpenFAST v5, which we’ll hopefully be released in early 2025.

Best regards,

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