Dear @Derrick.Rice,
The existing glue code that involves an implicit loose coupling scheme has been discussed in other topics, e.g., Integrating HydroDyn with Multibody Dynamics Model in Simulink for Two-Way Data Interchang and Loads and response transferring in OpenFAST · Issue #282 · OpenFAST/openfast · GitHub.
We are currently working on a paper to be submitted to the Wind Energy Science journal that explains the existing implicit loose coupling approach we’ve implemented within OpenFAST, as well as the new tight coupling approach we are finalizing now. We anticipate submitting this paper to WES soon.
Best regards,