# Linearization FAST Error

**URL:** <https://forums.nlr.gov/t/linearization-fast-error/673>\
**Category:** Computer-Aided Engineering Software Tools\
**Created:** [May 1, 2013, 5:06pm UTC](https://forums.nlr.gov/t/linearization-fast-error/673 "2013-05-01T17:06:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Hector.Sanchez](https://avatars.discourse-cdn.com/v4/letter/h/b19c9b/32.png) [@Hector.Sanchez](https://forums.nlr.gov/u/Hector.Sanchez)\
**Post date:** [May 1, 2013, 5:06pm UTC](https://forums.nlr.gov/t/linearization-fast-error/673/1 "2013-05-01T17:06:07Z")

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Hello everyone,

I am a PhD. student in Spain, and I am starting to work with FAST. I am trying to make a linearization analysis and after setting the primary.fst and NRELOffshrBsline5MW\_Linear.dat files, according to the indications of FAST User’s Guide pages 56-61, using a constant wind Hub-Height Wind Data File of 10 m/s wind speed.

The following error appears when executing FAST in Linearization Mode.

"C:\FDI FTC Benchmark FAST\FAST code\>FAST primary.fst  
Running NWTC Subroutine Library (v1.07.00b-mlb, 10-Jan-2013).  
Running FAST (v7.02.00d-bjj, 20-Feb-2013).  
Heading of the FAST input file: NREL 5.0 MW Baseline Wind Turbine for Use in Offshore Analysis.

Invalid numeric input. “True” found when trying to read the number, OutFileFmt.

Aborting FAST."

I don’t find information about this error or the parameter involved with it. OutFileFMT is the same as OutFMT in the .fst file?. In that case I don’t have a “True” value assigned to this parameter.

I would appreciate any suggestion.

Best regards,

Hector Sanchez  
PhD. Student  
Universitat Politècnica de Catalunya  
Terrassa, Spain

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**Author:** ![Bonnie.Jonkman](https://dub1.discourse-cdn.com/nrel/user_avatar/forums.nlr.gov/bonnie.jonkman/32/3230_2.png) [@Bonnie.Jonkman](https://forums.nlr.gov/u/Bonnie.Jonkman)\
**Post date:** [May 1, 2013, 6:30pm UTC](https://forums.nlr.gov/t/linearization-fast-error/673/2 "2013-05-01T18:30:39Z")

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Hi, Hector.

FAST v7.02.00d-bjj requires an extra line in its input file. OutFileFmt is a new parameter that indicates if the time series output files should be text or binary format. You can read about the change in the [addendum to the FAST User’s Guide](http://wind.nrel.gov/designcodes/simulators/aerodyn/UserGuideAddendum_AeroDyn13Interface.pdf) (see page 9).

You can look at some sample input files in the CertTest folder of the [FAST archive](http://wind.nrel.gov/designcodes/simulators/fast/) to see where this line should be placed.

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**Author:** ![Jason.Jonkman](https://dub1.discourse-cdn.com/nrel/user_avatar/forums.nlr.gov/jason.jonkman/32/3086_2.png) [@Jason.Jonkman](https://forums.nlr.gov/u/Jason.Jonkman)\
**Post date:** [May 1, 2013, 10:37pm UTC](https://forums.nlr.gov/t/linearization-fast-error/673/3 "2013-05-01T22:37:50Z")

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Hi, Hector,

To add to what Bonnie said, we’ve also updated the FAST input files of the various NREL 5-MW models (both land-based and offshore) to work with FAST v7.02.00d-bjj. You can find these here: [wind.nrel.gov/public/jjonkman/NR … Bsline5MW/](http://wind.nrel.gov/public/jjonkman/NRELOffshrBsline5MW/).

Best regards,

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**Author:** ![Hector.Sanchez](https://avatars.discourse-cdn.com/v4/letter/h/b19c9b/32.png) [@Hector.Sanchez](https://forums.nlr.gov/u/Hector.Sanchez)\
**Post date:** [May 2, 2013, 2:45pm UTC](https://forums.nlr.gov/t/linearization-fast-error/673/4 "2013-05-02T14:45:29Z")

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Hi Jason and Bonnie,

I have successfully executed my first linearization analysis!

Thanks so much for your help.

Best regards,

Hector Sanchez  
PhD. Student  
Universitat Politècnica de Catalunya  
Terrassa, Spain