Mr. Jonkman hi,
I ecountered some problems which I still haven’t solved and I would appreciate your help.
First of all, I use your 5-MW offshore wind turbine as a model. I modified it for my site (15m depth, 92.6m Hub height, tower height 77.6m). So, as you can see the differences are just small. I created wind files using TurbSim for wind speeds (4 different load cases):
1)11.4 m/s (ETM)
2)25 m/s (ETM)
3)41.6 m/s (NTM)
4)43.7 m/s (NTM)
I now use FAST_v7.02.00d-bjj_AeroDyn_v13.00.02a-bjj_BladedDLLInterface with all your files included and my wind files in it. I modified just a few things due to my different structure.
- case works well with no problems at all. The 3 other cases all have a warning message
WARNING: Small angle assumption violated in SUBROUTINE SmllRotTrans() due to a large blade
deflection. The solution may be inaccurate. Simulation continuing, but future warnings will be
Time step is 0.0125 and tried 0.00125 too in 630 sec simulation. The grid width-height in TurbSim are 145m
Maybe the warning is due to sudden loading of blades as mentioned above?
Also another problem I encountered is that even with a wind speed of 41.6 m/s at hub height somehow the turbine still works and generates power.
Shouldn’t the turbine be offline since the wind speed has by far surpassed the cut-out speed?
I’m sorry if my question is dumb, but I really don’t know where to look for this kind of problem.