Tight-Coupling Algorithm for OpenFAST 5.0 #2439
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…to use new structures
This function provides the extrapolation and interpolation routines for an array of values governed by module variables
…d VF_2PI flag for variables that are in the range of [0, 2PI]
MoorDyn: VIV and Rk4
openfast_IO MoorDyn compatibility
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This PR is ready to merge into the
dev-tcbranch. Which will go intodevonce further testing and development has been done.Feature 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
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.
In addition, testing of VTK output from modal analysis has not been verified to work. V
A new Visual Studio solution has been created based on the IFX compiler in
vs-build-ifx.Further development will occur to add an option for continuing to use a version of the loose coupling solve.
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.