How to setting the TurbSim inp file(Usabletime, Analysistime)

[onibini]

I'm having trouble editing the TurbSim input file, so I'm asking a question.

I was setting like this picture.

So what I'm wondering is this
If I run openfast as 1000 seconds,
I don't know how to set usabletime and analysistime.
Of course, I checked the manual, but it's hard to understand,
so I would appreciate it if you could tell me how to change the settings when running 1000 seconds.

[jjonkman]

Dear @onibini,

In TurbSim, AnalysisTime is the length of time turbulent wind is generated internally and UsableTime is the length of time written to the TurbSim output file. You can't have AnalysisTime be less than UsableTime (as you are showing).

For normal use where OpenFAST will be run for 600-s (10-min) after the start-up transient, I would recommend setting AnalysisTime = 600 s and UsableTime = "ALL", which will ensure TurbSim outputs all of its data and the InflowWind module of OpenFAST will interpret the data as periodic, which will allow you to run OpenFAST simulations of 600 s + some start-up transient time (typically 30-100 s, so, OpenFAST is run for TMax = 630-700 s with TStart = 30-100 s to throw out that start-up transient data). If you are aiming for 1000 s of actual OpenFAST output, change this prescription to AnalysisTime = 1000 s and TMax = 1030-1100 s.

Best regards,

[onibini]

Thank you very much for your reply. It helped me a lot in my research.