Some issues about TurbSim

[May0048]

Dear, (1) When using turbulent wind in FAST.Farm, high-resolution and low-resolution grids need to be generated separately with TurbSim? (2) If the above is true, which InflowFiles should each of the two output files (.bts) be placed in? Low-resolution output file to InflowFile in .fstf file? High-resolution output file into the InflowFile in .fst file? Mod_AmbWind choose 2 or 3? (3) If the high resolution and low resolution have the same dy and dz, do you still need to solve them separately with TurbSim? Do not select a InflowFile as shown below?

[May0048]

[jjonkman]

Dear @May0048,

Here are my answers to your questions:

1. Distinct TurbSim runs for the low- and high-resolution domains are used when Mod_AmbWind = 3 in FAST.Farm.
2. See the documentation found here regarding naming of InflowWind files: https://openfast.readthedocs.io/en/main/source/user/fast.farm/InputFiles.html#ambient-wind-with-inflowwind-module-input-files.
3. If you expect to use the same TurbSim discretization for the low- and high-resolution domains, Mod_AmbWind = 2 in FAST.Farm is what you should use.

Best regards,

[xiaoxiao90vip2022]

Dear NREL Scientist： In my recent work, I was looking to generate wind files for some EWM load case by Turbsim V2.0. The data I have is the data of typhoon conditions, Corresponds to IEC 61400-1 tropical load case, which means the mean wind speed will near 57 m/s. However, when I read Turbsim's manual, I found that Turbsim can not generate such kind of wind files. I don't know if my understanding is correct, and if so, I don't know if there is any way to simulate typhoon conditions. Best regards!

[jjonkman]

Dear @xiaoxiao90vip2022,

NREL has not updated TurbSim (yet) to support the tropical cyclone (T) class, but you can always use TurbSim to generate wind based on user-specified turbulence conditions, e.g., as discussed in the following topics on our forum: https://forums.nrel.gov/t/turbsim-ewm/419 https://forums.nrel.gov/t/turbsim-for-class-iv-from-iec-61400-1-2nd-edition/2047

That is, you can use TurbSim to generate winds that match EWM for T class by specifying: IEC_WindType = “NTM” URef = 57 m/s PLExp = 0.11 IECturbc = [user-specified] %

But your question is a good reminder that we should upgrade TurbSim at some point to directly support Edition 4 of IEC 61400-1.

Best regards,