Merge pull request #17 from ebranlard/f/flexsub2

FlexSub: introducing GuyanLoadCorrection instead of ExtraMoment
bjonkman · Jan 12, 2021 · 5a43248 · 5a43248
2 parents 72c5f17 + 62ac61d
commit 5a43248
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diff --git a/docs/source/user/api_change.rst b/docs/source/user/api_change.rst
@@ -27,7 +27,7 @@ IfW driver                                     7    WrHAWC             false
 IfW driver                                     8    WrBladed           false    WrBladed  - Convert all data to Bladed format? (flag)
 IfW driver                                     9    WrVTK              false    WrVTK     - Convert all data to VTK format? (flag)
 InflowWind                                     7    VFlowAng               0   VFlowAng  - Upflow angle (degrees) (not used for native Bladed format WindType=7)
-SubDyn                                         8    ExtraMom           False   ExtraMoment  - Include extra moment from lever arm at interface in interface reactions.
+SubDyn                                         8   GuyanLoadCorr.      False   GuyanLoadCorection  - Include extra moment from lever arm at interface and rotate FEM for floating
 SubDyn                                        15   GuyanDampMod        0       GuyanDampMod - Guyan damping {0=none, 1=Rayleigh Damping, 2=user specified 6x6 matrix}
 SubDyn                                        16   RayleighDamp        0.001, 0.003   RayleighDamp - Mass and stiffness proportional damping  coefficients (Rayleigh Damping) [only if GuyanDampMod=1]
 SubDyn                                        17   GuyanDampSize       6       GuyanDampSize - Guyan damping matrix size (square, 6x6) [only if GuyanDampMod=2]

diff --git a/docs/source/user/subdyn/examples/OC4_Jacket_SD_Input.dat b/docs/source/user/subdyn/examples/OC4_Jacket_SD_Input.dat
@@ -5,7 +5,7 @@ False            Echo        - Echo input data to "<rootname>.SD.ech" (flag)
 "DEFAULT"        SDdeltaT    - Local Integration Step. If "default", the glue-code integration step will be used.
              3   IntMethod   - Integration Method [1/2/3/4 = RK4/AB4/ABM4/AM2].
 True             SttcSolve   - Solve dynamics about static equilibrium point
-True             ExtraMoment - Include extra moment from lever arm at interface in interface reactions. 
+True             GuyanLoadCorrection - Include extra moment from lever arm at interface and rotate FEM for floating.
 -------------------- FEA and CRAIG-BAMPTON PARAMETERS---------------------------
              3   FEMMod      - FEM switch: element model in the FEM. [1= Euler-Bernoulli(E-B) ; 2=Tapered E-B (unavailable); 3= 2-node Timoshenko;  4= 2-node tapered Timoshenko (unavailable)]
              2   NDiv        - Number of sub-elements per member

diff --git a/docs/source/user/subdyn/input_files.rst b/docs/source/user/subdyn/input_files.rst
@@ -175,12 +175,14 @@ that are not considered by the C-B reduction are treated
 quasi-statically. This treatment helps
 minimize the number of retained modes needed to capture effects such as
 static gravity and buoyancy loads, and high-frequency loads transferred
-from the turbine.
+from the turbine. Recommended to set to True.
 
 
-**ExtraMoment** is a flag to specify whether the extra moment due to 
-the lever arm from the deflection of the structure is to be added to the loads passed to SubDyn.
-See section :numref:`SD_Loads` for details.
+**GuyanLoadCorrection** is a flag to specify whether the extra moment due to 
+the lever arm from the Guyan deflection of the structure is to be added to the loads
+passed to SubDyn, and, whether the FEM representation should be expressed in the rotating 
+frame in the floating case (the rotation is induced by the rigid body Guyan modes).
+See section :numref:`SD_Loads` for details. Recommended to set to True.
 
 
 FEA and Craig-Bampton Parameters