Resultant Primary Wind (MLife)

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Joseph.Arkley
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Joined: Fri Jul 12, 2019 8:36 am
Organization: Liverpool John Moores University
Location: Liverpool

Resultant Primary Wind (MLife)

Postby Joseph.Arkley » Wed Aug 21, 2019 10:13 am

Hello all,

Very brief question regarding the Primary Wind Speed Channel (WSChan) in an MLife input file.

I have some cases where my turbine is yawed by 60 degrees, the results are correct & match hand-calcs.

However, when I use MLife to process the data I can only specify one primary wind speed channel. I can't seem to figure out if I can use the resultant wind speed (Between x-axis and y-axis for example). This is effecting my binning as I can't compare with other cases correctly (aligned with 0 degrees)

I'd like to use the resultant, otherwise I am under evaluating the actual in-line wind speed

Is this possible? or will I have to modify my FAST .INP file to request some resultant value and re-run some cases?


UPDATE:

I believe I can achieve what I want by using the "HorWindV" or "TotWindV" in my InflowWind file as listed in the OutlistParameters speadsheet. However, when I request them - I get "INVALID" in my .OUT file.

Have these output requests changed? Maybe in their spelling etc..

Jason.Jonkman
Posts: 4218
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Resultant Primary Wind (MLife)

Postby Jason.Jonkman » Wed Aug 21, 2019 12:21 pm

Dear Joseph,

The ambient wind-related outputs "HorWindV" and "TotWindV" from older versions of FAST are not available from InflowWind. Instead, you can create your own calculated channel in MLife and use that e.g.

Code: Select all

"HorWindV" "(m/s)" "sqrt( timeSeriesData(:,$Wind1VelX$).^2 + timeSeriesData(:,$Wind1VelY$).^2 )"

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

Joseph.Arkley
Posts: 3
Joined: Fri Jul 12, 2019 8:36 am
Organization: Liverpool John Moores University
Location: Liverpool

Re: Resultant Primary Wind (MLife)

Postby Joseph.Arkley » Wed Aug 21, 2019 12:37 pm

Dear Jason,

Ah, I was thinking that might be the case!

So just to clarify as my experience in Matlab is limited - I can create a custom channel (say "HorWindV" in this case), specify that channel as the primary wind-speed channel (WSChan) in my .mlif input file, and MLife should proceed as normal just with a new channel as the windspeed.

Have I got that right?

Many thanks for replying, this is a fabulous resource.

Regards,


UPDATE: I had overlooked the Calculated Channels section in the MLife Users guide, so no need for a reply!

Manys thanks again

Jason.Jonkman
Posts: 4218
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Resultant Primary Wind (MLife)

Postby Jason.Jonkman » Wed Aug 21, 2019 4:29 pm

Correct!
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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