HydroDyn C-binding: Added mass matrix#2663
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andrew-platt merged 4 commits intoOpenFAST:dev-cbindfrom Apr 10, 2025
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…AddedMass that returns the instantaneous added-mass matrix for all input nodes and the reminder of the total hydro loads without added-mass contributions The Python library is also updated to support the new C-binding subroutine
andrew-platt
approved these changes
Apr 2, 2025
andrew-platt
approved these changes
Apr 10, 2025
This was referenced Jun 16, 2025
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Feature or improvement description
This PR adds a new subroutine in HydroDyn C-binding called
HydroDyn_C_CalcOutput_and_AddedMassthat returns a 6N-by-6N added mass matrix, where N is the number nodes in the coupling mesh (input to the subroutine). It also returns the remainder of the hydrodynamic, hydrostatic, and other loads computed by HydroDyn with the added-mass component removed.This subroutine is added to facilitate the coupling of HydroDyn with other structural solvers. It allows the added-mass loads to be treated as an unknown and solved for together with structure acceleration in the structural solver for stability. Note that added mass refers to not only hydrodynamic added mass, but also other inertial load components from internal ballast and marine growth.
Impacted areas of the software
HydroDyn C-binding only. No change to HydroDyn itself.
Test results, if applicable
No change to existing r-test results.