Dear Jason,
Apologies for late reply.
Thanks for your response.
By looking at the summary of the results, can observe lower mean values for wind only (ETM) for DTU 10MW turbine. The trend for wave loads are gradually increasing which is as desired results. I re-ran the analysis to check whether anything is missing, but it resulted in the same. Apart from these, the rated wind speed which I considered are inline with the corresponding turbines. Will version of aerodyn affect the results? as DTU 10MW uses Aerodyn14. I have attached DTU 10 MW wind only configuration inputs.
Thanks,
Satish J
DTU_10MW_Inputs_Wind_only.zip (29.3 KB)
Dear Satish,
I’m glad the results you are obtaining make sense to you.
AeroDyn v14 is now quite old and we generally recommend upgrading to AeroDyn v15. We plan to deprecate AeroDyn v14 (removing it from OpenFAST) soon. The results may be OK with AeroDyn v14, but AeroDyn v15 contains a number of improvements over AeroDyn v14.
Best regards,
Dear Jason,
Could I please know are there any set of results (excel sheets) for DTU 10MW wind turbine like OC3 task 23 as I wanted to validate DTU 10MW offshore model.
Thanks,
Satish J
Dear Satish,
I am not aware of any public database containing benchmark aeroservoelastic results coming from the DTU 10MW. Some summary statistics for the IEA 10MW (an upgraded DTU 10MW) are available in this report nrel.gov/docs/fy19osti/73492.pdf
I hope this helps.
Best regards,
Pietro Bortolotti
Hi @Jason.Jonkman or anyone:
Would you happen to have the FAST set files for DTU 10 MW reference wind turbine. The one with a hub height of 119 m and rated wind speed of 11.4 m/s. I found a version online but the hub height was just over 115 m so I am not sure if I using the correct version. Also, when I ran the model at rated wind speed, I got the following warning, which showed some NaNs:
PIDvar%outres= NaN
** PIDvar%outpro= -3.43415051805555**
** PIDvar%outdif= NaN**
** dt= 0.000000000000000E+000**
** PIDvar%error1_old(1)= 0.000000000000000E+000**
** error(1)= -1.00500000000000**
** PIDvar%Kdif(1)= 0.000000000000000E+000**
** Padded_term= 0.000000000000000E+000**
** PIDvar%outset= 0.000000000000000E+000**
The model did run successfully though so I initially overlooked the NaNs warning, until I read the thread above which seem to suggest that it indicates that there are numerical instabilities within the model.
Do you or anyone else has a working version of the original DTU 10 MW reference wind turbine? I am trying to validate some results from a paper where they used said wind turbine.
Regards,
AOAW
Dear @Andre.White,
Is this the OpenFAST model of the 10-MW reference wind turbine you are using: IEA-10.0-198-RWT/openfast at master · IEAWindTask37/IEA-10.0-198-RWT · GitHub? This is the IEA Wind Task 37 update to the DTU 10-MW wind turbine and it has a hub height of 119 m.
Best regards,
Hi @Jennifer.Rinker/everyone:
I am trying to run a simulation using the DTU-10MW Onshore RWT that you mentioned; need to use it to validate some results in a paper which used the same model. It states in the Readme doc that is works for FAST v8.12. However, the oldest version of FAST that I have is FAST v8.16. I tried to run the simulation with this version but received the following error:
Heading of the FAST input file:
FAST model of the DTU 10MW Reference Wind Turbine, onshore version 1.00
FAST_InitializeAll:FAST_Init:FAST_ReadPrimaryFile:Premature EOF for file “DTU_10MW_RWT.fst”
occurred while trying to read Section Header: Linearization.
FAST encountered an error during module initialization.
Simulation error level: FATAL ERROR
Do you know how I could fix this problem?
Thank you.
Regards,
AOAW
Hi @Jason.Jonkman just realized you responded after I sent message to @Jennifer.Rinker. No that was not the model that I used. I used the FAST version of DTU-10MW reference wind turbine. I had tried to use this IEA version and received the following error:
OpenFAST input file heading:
** Generated with AeroElasticSE FAST driver**
FAST_InitializeAll:FAST_Init:FAST_ReadPrimaryFile:Invalid numerical input for file
“IEA-10.0-198-RWT.fst” occurred while trying to read MHK.
OpenFAST encountered an error during module initialization.
Simulation error level: FATAL ERROR
Do you know how I could fix it? Not sure what the MHK error means.
Regards,
AOAW
Dear @Andre.White,
Sounds like the OpenFAST input files you are using are formatted for an older version of OpenFAST then you are using. See documentation on how the input files are changed with each release of OpenFAST here: 4.1.2. API changes between versions — OpenFAST v3.3.0 documentation. And you can always enable the Echo option to debug issues with input file formatting.
Best regards,
Hi @Jason.Jonkman would you happen to know rated wind speed for the 10MW reference wind turbine? I have checked and see 10.75 m/s, 9.8 m/s, 11.00 m/s. Not sure which value is correct.
I also see that minimum rotor speed is 6 rpm and max is 8.68 clarifying this as well.
Thank you.
Regards,
AOAW
Dear @Andre.White,
According to the IEA Wind Task 37 report, the rated wind speed of the IEA Wind 10-MW reference wind turbine is 11 m/s: https://www.nrel.gov/docs/fy19osti/73492.pdf. But according to the power performance result from CCBlade, it looks like the rated power is closer to 10.75 m/s: IEA-10.0-198-RWT/performance_ccblade.dat at master · IEAWindTask37/IEA-10.0-198-RWT · GitHub.
Best regards,
Hi @Jason.Jonkman:
Is there a way to get the blade natural frequencies of the DTUW 10 MW turbine in openfast?
Regards,
AOAW
Dear @Andre.White,
The linearization functionality of OpenFAST, followed by MBC3 and eigenanalysis, can be used to calculate the full-system mode shapes, natural and damped frequencies, and damping ratios as a function of rotor speed, wind speed, etc. This has been discussed many times on the forum and is documented here: GitHub - OpenFAST/matlab-toolbox: Collection of Matlab tools developed for use with OpenFAST.
Best regards,
Thank you @Jason.Jonkman.
Regards,
AOAW
@Jason.Jonkman:
Is the drag coefficient of the wind turbine tower stipulated in ElastoDyn or anywhere else?
Regards,
AOAW
Dear @Andre.White,
Tower aerodynamic loads are considered in AeroDyn, not ElastoDyn. The tower drag coefficient is specified in the AeroDyn primary input file.
Best regards,
Hi @Jason.Jonkman is it specified in AeroDyn15. I have checked but do not see a value for the drag coefficient. Am I looking at the correct place?
Regards,
AOAW