Problem with Crunch - column reference

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Carol.Videiro
Posts: 6
Joined: Wed Mar 13, 2019 1:32 pm
Organization: UFRJ
Location: Brazil

Problem with Crunch - column reference

Postby Carol.Videiro » Tue Jun 18, 2019 7:43 am

Hi,

I'm trying to run Crunch, but it appears the following error:
"Your expression seems to be making an invalid data column reference"

Error_Crunch.png
Error_Crunch.png (19.06 KiB) Viewed 462 times


So, my question is about how it orders the columns. At the file .out, I think that column 1 is Time (s) and column 2 is Wind1VelX (m/s). Is this right ?

DLC.out.png
DLC.out.png (50.58 KiB) Viewed 462 times


Do I have to update all the column references in .cru file?

DLC.cru.png
DLC.cru.png (41 KiB) Viewed 462 times


For instance, YawBrFxp is calculated as 1.35*C11, but at the file output YawBrFxp is in column 30.

Thanks

Carol.Videiro
Posts: 6
Joined: Wed Mar 13, 2019 1:32 pm
Organization: UFRJ
Location: Brazil

Re: Problem with Crunch - column reference

Postby Carol.Videiro » Tue Jun 18, 2019 7:44 am

For instance, YawBrFxp is calculated as 1.35*C11, but at the file output YawBrFxp is in column 30.

Column_reference.png
Column_reference.png (31.69 KiB) Viewed 461 times

Jason.Jonkman
Posts: 4223
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Problem with Crunch - column reference

Postby Jason.Jonkman » Tue Jun 18, 2019 12:36 pm

Dear Carol,

Regarding the "invalid data column reference" error, a similar question has been asked and answered in the following forum topic: viewtopic.php?f=4&t=2271&p=12859.

Yes, time is the first column and Wind1VelX is the second column in your example OpenFAST output file.

I'm not sure I understand your last question, but the channel numbers specified in the Crunch input file should match those of the OpenFAST output file. So, if you need to use the data in column 30, you should reference C30 in your Crunch input file.

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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