Issue Calling MoorDyn in Wec-Sim

[cyweco]

Hi there,

I'm trying to run the RM3 example from the Wec-Sim tutorials with added mooring from the Wec-Sim applications repo. I've changed nothing to the files in these folders.

I am using matlab

>> version

ans =

    '25.2.0.3150157 (R2025b) Update 4'

and I've downloaded the MoorDyn version from the Wec-Sim repo and stored the files in the WEC-Sim\source\functions\moorDyn folder.

with this setup, my Matlab crashes (see crash log matlab_crash.txt ).

Next I've tried to compile both MoorDyn v2.6.1 as well as MoorDyn v2.4.0 myself and place the built libmoordyn.dll file in the \WEC-Sim\source\functions\moorDyn folder. This gives me the following error:

>> wecSim
WEC-Sim: An open-source code for simulating wave energy converters
Version: 7.0.0

Initializing the Simulation Class...
	Case Dir: C:\Users\delap\Documents\MATLAB\Weco-Sim\RM3 
---------------Starting MoorDyn-----------
Error using loadlibrary
There was an error loading the library "C:\Users\delap\Documents\MATLAB\WEC-Sim\source\functions\moorDyn\libmoordyn.dll"
The specified procedure could not be found.

any ideas to move forward are very welcome! :)

[RyanDavies19]

@jtgrasb can you answer this?

[jtgrasb]

@RyanDavies19 Unfortunately, I have not been able to determine the cause of this issue. I am not able to replicate this one locally, but it seems like the dynamic library coupling between WEC-Sim and MoorDyn is causing a number of users to experience MATLAB crashes, but unsure of the exact cause yet.

It seems like even when compiled locally, the dll is not being loaded properly. When compiling locally, should he also have new .h and API.h files? Perhaps it would be an issue if he's just adding the new dll?

[RyanDavies19]

@jtgrasb good call. @cyweco have you ensured that the .h files in the WEC-Sim/source/functions/moorDyn/ directory with the dll match the .h files from the MoorDyn version you compiled locally? They are located in MoorDyn/source/.

If those mismatch it would likely throw this error.