Issues with the viscoelastic functionality of MoorDyn v2

Wind & Water Computer-Aided Engineering Software Tools
1

Dear everyone,

I would like to use the functionalities of MoorDyn v2 to model the viscoelastic properties of the synthetic mooring lines of the FOWT model I am running in OpenFAST.

From MoorDyn user guide (Input Files — MoorDyn 2.3.1 documentation), I can see that there is two ways to account for both the static and dynamic stiffnesses:

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I would like to use the load dependent dynamic stiffness method. I have all the required inputs. However when I am running my OpenFAST model, I have this error:
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I am using OpenFAST v3.5.3 and my MoorDyn inputs are:

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Would you have an idea on how I can solve this error?

Thanks a lot!

2

Hi @Azelice.Ludot,

The load dependent dynamic stiffness was just recently added to OpenFAST, so it is only available on the dev branch at the moment. To use it, you’ll need to change to dev and compile OpenFAST from source.

Once you get there, I’ll be interested in seeing your results. You are one of the first users of this feature.

Best, Ryan