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Fix MoorDyn initial fairlead positions when SubDyn is present #3316

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Merged
andrew-platt merged 1 commit into from
Apr 23, 2026
+10 −1
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Fix MoorDyn initial fairlead positions when SubDyn is present #3316

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11 changes: 10 additions & 1 deletion modules/openfast-library/src/FAST_Subs.f90
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Original file line number Diff line number Diff line change
Expand Up @@ -373,7 +373,7 @@ SUBROUTINE FAST_InitializeAll( t_initial, m_Glue, p_FAST, y_FAST, m_FAST, ED, SE
! Save the GearBox index
p_FAST%GearBox_index = Init%OutData_ED(iRot)%GearBox_index

! Assign the inital positions for use by MoorDyn initalization
! Assign the initial positions for use by MoorDyn initialization
p_FAST%PlatformPosInit = Init%OutData_ED(iRot)%PlatformPos

! If steady state calculation is enabled
Expand Down Expand Up @@ -992,6 +992,15 @@ SUBROUTINE FAST_InitializeAll( t_initial, m_Glue, p_FAST, y_FAST, m_FAST, ED, SE
Init%OutData_SD%Vars, p_FAST%Linearize, ErrStat2, ErrMsg2)
if (Failed()) return

! Assign the initial positions for use by MoorDyn initialization (this overwrites the PlatformPosInit from ED above)
if (Init%OutData_SD%SDHasRBDoF) then
p_FAST%PlatformPosInit = Init%OutData_SD%PlatformPos
else if (.not.Init%OutData_SD%IsFloating) then
p_FAST%PlatformPosInit = 0.0_DbKi
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! else
! Use PlatformPosInit from ED above
end if

case (Module_ExtPtfm)

Init%InData_ExtPtfm%InputFile = p_FAST%SubFile
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