Tight-Coupling Algorithm for OpenFAST 5.0 #2439
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This functionality will need to be migrated to the new FAST_ModLin module
Previously these functions required the whole Turbine structure to be passed in, which was a holdover from the original mesh getting functions
This adds the appropriate mappings between ServoDyn and ElastoDyn which were previously missing and applies values in linearization
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This PR will be merged once OpenFAST 4.0 is released.
TODO:
openfast-libraryFeature or improvement description
Tight coupling introduces a shared solver around structural modules, based on generalized alpha method, while leaving the remaining modules loosely coupled. The goal of the tight coupling algorithm is to improve computational performance by allowing significantly larger time steps while resolving the time domain structural dynamics
Related issue, if one exists
Impacted areas of the software
The majority of the code in
openfast-libraryhas been reworked to support the tight-coupling algorithm and streamline the process of linearization. The concept of module variables was introduced and a new function and associated data structures were added to each module to specify the global variables and Jacobian matrices contributed.Two existing features are incompatible with this version: Yaw Friction and HSS brake. This will be remedied in a future PR and an issue has been created to track their progress.
Additional supporting information
Test results, if applicable
Due to significant changes in the solution algorithm, all of the regression test results were sufficiently different to require creating new baseline files. However, the results from each test were manually evaluated against prior baselines and found to be acceptable.