Hello,
Thank you for your attention.
I’m studying a coupled response of TLP floating wind turbine. While doing a calculation in FAST, I found my WAMIT file from SESAM HydroD should be changed to the proper input file for FAST. Could you explain how to convert from WAMIT(1.dat and 3.dat) file to FAST input file?
Herein the files are attached.
Thanks.
Hailey.Seo
WAMIT_5S.3.txt (349 KB)
WAMIT_5S.1.txt (53.2 KB)
Timestep: 65 of 1000 seconds. Estimated final compleation at 16:17:32.
FAST_Solution : CalcOutputs_And_SolveForInputs:SolveOption2:InflowWind_CalcOutput : CalcOutput:IfW_TSF
FWind_CalcOutput [position=(-8.523, -19.844, 50.377) in wind-file coordinates]:Error: FF wind
array was exhausted at 65.35 seconds (trying to access data at 72.102 seconds).
FAST encountered an error at simulation time 65.338 of 1000 seconds.
Simulation error level : FATAL ERROR
Aborting FAST.
Dear Hailey,
I haven’t looked at your files in detail, but the format of the WAMIT-generated output files (*.1, *.3, and *.hst for first order, etc.) needed by HydroDyn can be found in Chapter 4 of the WAMIT User’s Manual, available online: wind.nrel.gov/nwtc/docs/HydroDyn_Manual.pdf.
An error regarding the “FF wind array was exhausted” has been discussed many times on this forum e.g.: Error: FF wind array was exhausted - #6 by Jason.Jonkman.
I hope that helps.
Best regards,
@Jason.Jonkman Dear Jason,
I want to convert the wind output of fast.farm in vtk format into bts format file, or output the wind data in bts format by fast.farm directly. Is there any way? Thank you in advance.
Best regards,
Liye
Dear @Liye.Zhao,
I’m not aware of a script that will do exactly what you want. But there are scripts in the MATLAB Toolbox (matlab-toolbox/Utilities at main · OpenFAST/matlab-toolbox · GitHub) and Python Toolbox (python-toolbox/pyFAST/input_output at main · OpenFAST/python-toolbox · GitHub) that will get you part way there.
Please note that the FAST.Farm output in VTK format can be 4D, with 3 spatial and 1 time dimensions . However, the TurbSim BTS format is only 3D, with 2 spatial and 1 time dimensions. So, what you propose likely only makes sense if you output a plane of data from FAST.Farm, e.g., through NOutDisWindYZ and OutDisWindX.
Best regards,
Dear Jonkman,
Excuse me, are all the data in the. 1 file dimensionless? The first column is frequency or period, the second and third columns are matrix indices, the fourth column is additional mass matrix data, and the fifth column is radiation damping coefficient matrix data.
And how is nondimensionalization done in Waimit?
Best regards,
Dear @Cuizhi.Zhu,
The hydrodynamic added mass and radiation damping matrices in the WAMIT .1 output file are nondimensional. This nondimensionalization is documented in Chapter 4 of the WAMIT User’s Manual, available online: https://www.wamit.com/manual6.4/Chap4.pdf.
Best regards,
Dear Jason, Im trying to make a WAMIT.1 using WADAM for the IEA-15-240-RWT-UMaineSemi. My WADAM file contains values for hydrodynamic added mass and radiation damping matrices for all matrix indices. For example I have values for 1 1, 1 2, 1 3, 1 4, 1 5, 1 6 but in the WAMIT.1 file i found in hydrodata folder for the IEA-15-240-RWT-UMaineSemi there are only values for 1 1, 1 3 and 1 5. Do I need only those values because my results are different when i use my WAMIT.1 file with all of these values?
best regards
Dear @Georgia.Tsoukleri,
In the WAMIT .1 and .3 output file formats, values that are zero are not included in the file.
Due to the XZ plane of symmetry, I would expect the (1,2), (1,4), and (1,6) values to be zero or near zero.
Best regards,