I am working on adding rigid tower elements to my Floating offshore wind turbine model. From the attached photo, the red hatched part is the rigid tower element I wish to add. I tried to add this rigid part by including elements in TwrFile with very small mass density (I don’t want the mass of the total system to change by adding these elements) and very high stiffness. However, after running the simulation under irregular waves simulation crashed. The warning and error messages are as shown below.
angle assumption violated in SUBROUTINE SmllRotTrans() due to a large platform displacement
(ElastoDyn SetCoordSy). The solution may be inaccurate. Simulation continuing, but future
warnings from SmllRotTrans() will be suppressed.
Additional debugging message from SUBROUTINE SmllRotTrans(): 1.00000E-02 s
ut: Angles in GetSmllRotAngs() are larger than 0.4 radians.
ED_HD_InputOutputSolve:HydroDyn_CalcOutput: Angles in GetSmllRotAngs() are larger than 0.4
FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption1:MAP_CalcOutput:MAP_FATAL : Number
of function calls has reached or exceeded INNER_MAX_ITS. Line segment 1.
MAP_FATAL : Number of function calls has reached or exceeded INNER_MAX_ITS. Line segment 2.
MAP_FATAL : Number of function calls has reached or exceeded INNER_MAX_ITS. Line segment 3.
FAST encountered an error at simulation time 0 of 100 seconds.
Simulation error level: FATAL ERROR
Can you please help me solve this issue?? I would be really appreciate.