Horizontal wind profile

Discuss the effects of turbulence on wind turbines and its simulation.

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Christophe.delFosse
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Joined: Sun Feb 21, 2021 2:43 pm
Organization: KU Leuven
Location: België

Horizontal wind profile

Postby Christophe.delFosse » Tue Mar 09, 2021 3:30 am

Dear all,

In the TurbSim v2.00.00 manual I read that a user defined vertical mean wind speed profile can be used. Is it possible to also define a horizontal mean wind speed profile? I would like to define a 2D mean windspeed inflow profile to represent a far wake inflow.

Would it also be possible to add a mean flow to the generated .wnd files? For example that I would add a wake to an existing .wnd file by changing the mean values at certain points in the grid?

Thank you in advance.

Sincerely,
Christophe

Jason.Jonkman
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Re: Horizontal wind profile

Postby Jason.Jonkman » Tue Mar 09, 2021 6:28 am

Dear Christophe,

The user-specified wind profile option in TurbSim v2.00 allows you to specify the mean wind speed and mean wind direction as a function of height, but does not allow you to specify a more general 2D mean wind profile. For that, you'd have to change the TurbSim source code.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Christophe.delFosse
Posts: 9
Joined: Sun Feb 21, 2021 2:43 pm
Organization: KU Leuven
Location: België

Re: Horizontal wind profile

Postby Christophe.delFosse » Tue Mar 09, 2021 6:48 am

Dear Dr. Jason Jonkman,

I am not familiar with coding in Fortran. Is there any other way to represent a waked inflow? For example when I have a .wnd file generated by TurbSim for a 35x35 grid, would it be possible to change the mean values at each gridpoint to a desired value?

Best regards,
Christophe

Jason.Jonkman
Posts: 5738
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
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Re: Horizontal wind profile

Postby Jason.Jonkman » Tue Mar 09, 2021 7:01 am

Dear Christophe,

In lieu of changing TurbSim, another option could be to develop a script to read the TurbSim data, modify it, and write the updated TurbSim file. I'm not aware of a MATLAB-based writer of TurbSim binary (*.bts) formatted wind data files, but there is a MATLAB-based reader, readfile_BTS.m, in the MATLAB Toolbox: https://github.com/OpenFAST/matlab-tool ... /Utilities. I'm sure with a bit of work, this script could be updated to become a writer. Of course, there is a Fortran-based writer inherent within the TurbSim source code.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Christophe.delFosse
Posts: 9
Joined: Sun Feb 21, 2021 2:43 pm
Organization: KU Leuven
Location: België

Re: Horizontal wind profile

Postby Christophe.delFosse » Tue Mar 09, 2021 12:15 pm

Dear Dr. Jason Jonkman,

Thank you for your quick reply! Do I also need to change the summary file (.sum) or is it sufficient to just change the full field time series (.wnd) file?

Sincerely,
Christophe

Jason.Jonkman
Posts: 5738
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Horizontal wind profile

Postby Jason.Jonkman » Tue Mar 09, 2021 1:08 pm

Dear Christophe,

You should only need to change the *.wnd file, if you are using Bladed-formatted files (or the *.bts file if using TurbSim format). The summary (*.sum) file used together with the *.wnd file in Bladed format stores the mean wind speed, but not the wind profile.

If you are not already familiar, the appendices in the InflowWind User's Guide and Theory Manual would likely be informative to you: https://drive.google.com/file/d/1-yJox2 ... sp=sharing.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov


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