Hi All,
I just re-compiled OpenFAST on my computer this week and currently trying to use OC4Jacket example as my model. OpenFAST is currently installed, however I am getting errors when i am trying to run the provided OC4 example. The errors is in the quote below. The error is not produced when i use CompAero=1 . Any suggestion about this?
Dear Boma,
From your error messages, my guess is your AeroDyn primary input file is formatted improperly. As with any input file format problem, I suggest that you use the Echo option from the primary AeroDyn input file to debug errors in the input-file processing.
Best regards,
Dear Dr. Jonkman,
Thank you for the suggestion. However, I have not changed the provided input. I simply tested the distributed files and it worked with another installation on different computer. Was there an update that might cause this?
Dear Boma,
I’m not sure. Which FAST archive did you download? What does the use of Echo tell you?
Best regards,
Dr. Jonkman,
I downloaded the one posted on github page. Quoted below is the echo from AeroDyn15. I noticed that the provided input from github.com/OpenFAST/r-test does not list SkewModFactor. Did I download the outdated example?
Dear Boma,
SkewModFactor was added in AeroDyn (along with other features) with the release of OpenFAST v2.0.0. My guess is you are running OpenFAST v2.0.0, but are using the input files from r-test 1.0.0. I asked Raf Mudafort, who released OpenFAST v2.0.0 and it sounds like the r-test page was not updated properly after the release of OpenFAST v2.0.0. This has now been fixed and you can download the r-test for OpenFAST v2.0.0 here: github.com/OpenFAST/r-test/releases. Sorry for the confusion.
Best regards,
Hi,
I recently downloaded the pre-compiled OpenFAST v8.17 from github, and I have successfully run some of the test cases. Previously, I’ve been trying to see the output through reading output files into Matlab manually or plotting the .vtk through Paraview. I am also new to structural analysis. Now that I want to explore OpenFAST more, there are several questions that come across:
I am aware that OpenFAST uses a matlab toolbox for the post processing but I could not make this functions work. Is there an example script that demonstrate some of typical analysis related to the structure? (i.e, plotting modes shape of structures, getting natural frequency of the structures). Or simply where should I start with the matlab toolbox?
I found some Matlab scripts that requires to .lin files. Therefore, I tried to generate this file by activating the linearization in .fst files (I chose 5MW+monopile example). However, I got an error that says:
FAST_Init:ValidateInputData:Linearization is not implemented for the HydroDyn module.
ValidateInputData:Linearization is not implemented for any of the substructure modules.
Any suggestion would help me much to use OpenFAST correctly.
Thank you.
Dear Boma,
Here are my answers to your questions:
The MATLAB Toolbox provides many useful functionalities in MATLAB, but there are other ways to post-process FAST results. We often use the MATLAB-based post-processors MCrunch, MLife, and MExtremes to post-process many sets of FAST time-series outputs: github.com/OpenFAST/openfast/pull/373.
We’ve recently introduced linearization capability in OpenFAST pertinent to floating offshore wind turbines, including linearization of HydroDyn hydrodynamics and MAP++ mooring quasi-statics. This capability is available in a pull request, which has not yet been reviwed and merged into OpenFAST-dev–see: github.com/OpenFAST/openfast/pull/350. Until this pull request is merged, you must disable HydroDyn and MAP++ when linearizing OpenFAST.
Best regards,
Hi all,
I am new to FAST and currently trying out FAST v8. I noticed that I can not change the total run time in the TEST24.fst file input file from 60 seconds to say 120 seconds. It comes up with the error below in quote;
"FAST_Solution:CalcOutputs_And_SolveForInputs:SolveOption2:InflowWind_CalcOutput:CalcOutput:IfW_TSF
FWind_CalcOutput [position=(-5, 0, 90) in wind-file coordinates]: Error: FF wind array was
exhausted at 65.65 seconds (trying to access data at 72.108 seconds).
FAST encountered an error at simulation time 65.638 of 120 seconds.
Simulation error level: FATAL ERROR
Aborting FAST."
Can someone advise on how to go about running simulation with a longer run time?
Thank You.
Hi All,
Please is it possible for me to model a different type of floating platform apart from the traditional TLP, Spar and Semisubmersible available as test input files in FAST8? In a nut shell, how can I integrate a bespoke floating platform to work with OPENFAST/FAST?
Kind Regards.
Hello, dear friends:
I downloaded the FAST_V8.16, and run the test25(semi-submersible) successfully. After that, I got some results and used MATLAB TOOLBOX to process that.Now I want to get more outputs related to Mooring and Hydrodynamic modules, such as water speed and wave direction. But I can not find the name of thses outputs in the ‘outlist parameter’ excel file. what’s more, I can 't find Mooring and Hydrodynamic output areas in the outlistparameters file. I will aprreciate it very much if anyone can tell me how to find out all the output names.
Dear Xiangheng.Feng,
The HydroDyn output parameters are documented in Appendix C of the draft HydroDyn User’s Guide and Theory Manuel (nwtc.nrel.gov/HydroDyn.
Test25 uses MoorDyn, whose output parameters are documented in the MoorDyn User’s Guide (matt-hall.ca/files/MoorDyn-U … -08-16.pdf).
Best regards,
Dear Adebayo,
The FAST CertTest only provides sample input; the wind files in particularly were purposely made very short to reduce the size of the FAST archive. You should run TurbSim to generate the turbulent wind data that you need for your own use: nwtc.nrel.gov/TurbSim.
Can you clarify what you mean by a “bespoke floating platform”? Do you have a specific floating platform technology in mind?
Best regards,
Dear Jason,
Thanks for your response. I will explore how to run Turbsim to fix this issue.
What I meant by bespoke floating platform is the ability to model different floating platform shapes and geometry (apart from TLP, SPAR and Semisub shapes) and still connect to mooring lines. However, on reading other posts on this forum, I found new platform design parameters can be specified in WAMIT before incorporating it into FAST/OpenFast.
Example is a multiunit platform that can support multiple turbine is not among the Fast_v8 examples and this will have to be modelled before incorporating into FAST/OpenFast.
Thanks,
Bayo.
Dear Bayo,
Certainly FAST can model many different floating substructure topologies by specifying the pertinent hydrodynamic (potential flow, strip theory, or a hybrid combination of the two), structural (mass / inertia), and mooring properties in the HydroDyn, ElastoDyn, and mooring (MAP++, MoorDyn, or FEAMooring) modules, respectively. Without modification of the source code, FAST is not currently capable of modeling multiple wind turbines installed atop a single floating platform.
The substructure for a floating wind turbine has historically been modeled in FAST as a rigid body with hydrodynamic loads lumped at a point, which enables the tool to predict the global response of the floating substructure but not the structural loads within its individual members. We are currently working on the implementation of floating substructure flexibility and member-level loads into OpenFAST to enable the design and optimization of floating substructures–especially next-generation floating wind technologies that show promise to be streamlined, flexible, and cost-effective. While this functionality is not yet available, you can read about the work in our recent paper published and presented at IOWTC 2019: nrel.gov/docs/fy20osti/74380.pdf. More recently, we presented on the theoretical details of the implementation at DeepWind 2020, but this paper is still under review before publication.
Best regards,
Hi Jason,
Thanks for the informative response.
Kind Regards,
Bayo.
Hi all,
I have never used FAST before and I am trying to write a dissertation using FASTV8 but keep getting the attached error message, “The code execution cannot proceed becasue MAP_win32 was not found. Reinstalling the program may fix this problem.”. I have tried reinstalling the files along with trying other input files (such as test01) to check if it was them but to no avail. Any advice or help would be much appreciated.
Kind regards,
Thomas Kirk
Dear Thomas,
I would guess you’ve located the FAST_Win32.exe in a different directory than the MAP_Win32.dll. Both the executable and DLL are provided in the FAST v8 archive; ensuring that they are located in the same directory should eliminate this error.
Best regards,
Hi,
I am trying to run the 5MW_OC3Mnpl_DLL_WTurb_WavesIrr.fst file through Openfast executable file for the first time. But I am getting the following error, please anyone suggest me on this.
Thanks,
Satish J
[code]Running ElastoDyn.
Nodal outputs section of ElastoDyn input file not found or improperly formatted.
FAST_InitializeAll:ED_Init:ED_ReadInput:ReadBladeInputs:ReadBladeFile:OpenFInpFile:The input
file, “.../5MW_Baseline/NRELOffshrBsline5MW_Blade.dat”, was not found.
FAST encountered an error during module initialization.
Simulation error level: FATAL ERROR
Aborting OpenFAST.[/code]
Dear Satish,
It looks like two errors are reported. The first regarding “nodal outputs” is likely related to a formatting problem in your ElastoDyn primary input file. As with any error in the input file processing, I would recommend enabling the Echo option to debug.
The second error regarding “input file not found” is likely related to a problem with the path to the ElastoDyn blade input file. I would check the path to this file and set it properly in the ElastoDyn primary input file.
Best regards,
