Dear Jason,
Thank you for your reply.
I have modified the initial conditions as follows:
However, when I am performing multiple simulations at 25m/s wind speed with randomly selected random seeds in TurbSim, about 20% of the simulation are aborted due to the two following reasons:
-
FAST_Solution:FAST_AdvanceStates:AD_UpdateStates:SetDisturbedInflow:TwrInfl:Tower strike.
-
FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption2:AD_CalcOutput:RotCalcOutput:BEMT_CalcOutput(node 18, blade 2): UA_CalcOutput:Mach number exceeds 1.0. Equations cannot be evaluated.
For the first case, the tower clearance reaches around 3m as shown in the following figure, which triggers the tower strike I guess. I also notice the abnormal behavior of blade pitch as shown below.
For the second case, the mach number becomes unstable and triggers the error.
I have no idea how I can further modify the model to avoid such situation.
Another situation is that, even though OpenFAST terminated normally, the load might be too little. For example, when I ran this model at 19m/s wind speed, the blade root flapwise bending moment may look like this:
The maximum of blade root flapwise bending is only 3000 kNm, which is much lower compared with existing studies. Is it because the turbine is not in the normal working condition?