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by Jason.Jonkman
Wed Jul 01, 2020 6:33 am
Forum: Computer-Aided Engineering Software Tools
Topic: Instructions for Compiling FAST
Replies: 246
Views: 128022

Re: Instructions for Compiling FAST

Dear Sergio, I can't answer your CMake/Linux compiling-related questions; for those, I suggest posting on the OpenFAST github issues page: https://github.com/OpenFAST/openfast/issues. Are the simulations that are "failing" all of the offshore cases? The HydroDyn module of OpenFAST currentl...
by Jason.Jonkman
Wed Jul 01, 2020 6:23 am
Forum: Computer-Aided Engineering Software Tools
Topic: Start-up of NREL 5MW
Replies: 4
Views: 95

Re: Start-up of NREL 5MW

Dear Paul,

I'm curious if the ROSCO Toolbox-developed controller for the NREL 5-MW baseline wind turbine has a similar sensitivity to initial conditions: https://github.com/nrel/rosco? This is something I don't know the answer to.

Best regards,
by Jason.Jonkman
Tue Jun 30, 2020 6:35 pm
Forum: Computer-Aided Engineering Software Tools
Topic: HydroDyn - example .1, .3 and .hst files
Replies: 8
Views: 1105

Re: HydroDyn - example .1, .3 and .hst files

Dear Adebayo, As I announced here: https://wind.nrel.gov/forum/wind/viewtopic.php?f=38&t=1001, the NWTC Information Portal crashed before the replacement site is available. I've now shared the old FAST v8 archive here: https://drive.google.com/drive/folders/10Pw8zzOr_YqIgtLmq10XhYpdAveKAWAJ?usp=...
by Jason.Jonkman
Tue Jun 30, 2020 4:07 pm
Forum: Computer-Aided Engineering Software Tools
Topic: FAST theory manual
Replies: 303
Views: 45483

Re: FAST theory manual

Sent.
by Jason.Jonkman
Mon Jun 29, 2020 6:53 am
Forum: Computer-Aided Engineering Software Tools
Topic: BeamDyn Input
Replies: 9
Views: 2325

Re: BeamDyn Input

Dear Jan, I'm not aware of any other BeamDyn documentation than what is included on OpenFAST readthedocs: https://openfast.readthedocs.io/en/master/source/user/beamdyn/index.html. I'm not sure what you mean by damping of rigid-body modes. Damping is not really defined for rigid body modes and BeamDy...
by Jason.Jonkman
Mon Jun 29, 2020 6:41 am
Forum: Systems Engineering Software Tools
Topic: Installation of OpenFAST
Replies: 13
Views: 7144

Re: Installation of OpenFAST

Dear Tiasa, The most straightforward (and recommend way) to compile OpenFAST on Windows is using an Intel Fortran compiler together with Microsoft Visual Studio Community. Microsoft Visual Studio Community is free, but the Intel Fortan compiler requires a paid license. Perhaps I missed it, but I don...
by Jason.Jonkman
Mon Jun 29, 2020 6:33 am
Forum: Structural Analysis
Topic: Deflection of ElastoDyn
Replies: 15
Views: 536

Re: Deflection of ElastoDyn

Dear Dhaneesh,

Yes, that all sounds correct.

Best regards,
by Jason.Jonkman
Fri Jun 26, 2020 5:48 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization Problem in OpenFast V2.3
Replies: 4
Views: 76

Re: Linearization Problem in OpenFast V2.3

Dear Mohamed,

What is meant by cases 1-3?

When running OpenFAST-dev, I assume you mean that you compiled the source code from OpenFAST-dev. Are you also using the dev branch of the r-test, which contains input files with updated HydroDyn formatting?

Best regards,
by Jason.Jonkman
Fri Jun 26, 2020 3:13 pm
Forum: Structural Analysis
Topic: Deflection of ElastoDyn
Replies: 15
Views: 536

Re: Deflection of ElastoDyn

HI Dhaneesh, FAST considers the mass, stiffness, and the structural response and loading of the tower, but it does not directly calculate tower yield or failure. These analyses are typically done in a post-process of FAST, as has been discussed on this forum before, e.g., search for "yield"...
by Jason.Jonkman
Fri Jun 26, 2020 10:49 am
Forum: Structural Analysis
Topic: Processing OpenFast linearization output
Replies: 56
Views: 1615

Re: Processing OpenFast linearization output

Dear Srinivasa, Correct, but you'll want to set the LinTimes such that you cover a full rotor revolution of the rotor over NLineTimes steps, i.e.: deltaT = (60 s/min)/( RotSpeed*NLinTimes ) where RotSpeed is in rpm LinTimes(1) = 200 s (or whatever is needed to be in steady state) LinTimes(2) = LinTi...
by Jason.Jonkman
Fri Jun 26, 2020 10:23 am
Forum: Structural Analysis
Topic: Processing OpenFast linearization output
Replies: 56
Views: 1615

Re: Processing OpenFast linearization output

Dear Srinivasa,

Sorry, I meant CalcSteady = False rather than TrimCase = 0.

Best regards,
by Jason.Jonkman
Fri Jun 26, 2020 8:24 am
Forum: Structural Analysis
Topic: Processing OpenFast linearization output
Replies: 56
Views: 1615

Re: Processing OpenFast linearization output

Dear Srinivasa, It appears that there is not enough damping in the system to reach a steady state and I'm not sure I understanding what is happening at 10000 s. Reducing TrimGain may help to reduce the oscillations. That said, the solution is likely sufficiently converged by 200 s, so you can probab...
by Jason.Jonkman
Fri Jun 26, 2020 7:44 am
Forum: Structural Analysis
Topic: Processing OpenFast linearization output
Replies: 56
Views: 1615

Re: Processing OpenFast linearization output

Dear Srinivasa, The "Linearization" section you included in your forum post differs from the "Linearization" section in your attached zip archive. Which one are you using? TrimCase = 3 doesn't really function when you disable aerodynamics (because changing the blade-pitch in this...
by Jason.Jonkman
Fri Jun 26, 2020 7:22 am
Forum: Computer-Aided Engineering Software Tools
Topic: Linearization Problem in OpenFast V2.3
Replies: 4
Views: 76

Re: Linearization Problem in OpenFast V2.3

Dear Mohamed, In OpenFAST v2.3, there are 9 standard linearization inputs...the same ones documented in the FAST v8 ReadMe file: https://drive.google.com/file/d/17LDwMnCVmLfbRWSaVFxxqphVrtawMwlj/view?usp=sharing. Input 9 is collective blade pitch. But I see a few problems with your approach: ⋅&...
by Jason.Jonkman
Fri Jun 26, 2020 7:09 am
Forum: Computer-Aided Engineering Software Tools
Topic: Old Versions of FAST
Replies: 2
Views: 73

Re: Old Versions of FAST

Dear Mohamed, As I announced here: https://wind.nrel.gov/forum/wind/viewtopic.php?f=38&t=1001, the NWTC Information Portal crashed before the replacement site is available. I've now shared old versions of FAST here: FAST v7: https://drive.google.com/drive/folders/12JZQ91qeoi2uIWgp9YGX0FNCY8Ol77S...

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