Search found 10 matches

by Andy.Platt
Mon Dec 21, 2020 12:24 pm
Forum: Computer-Aided Engineering Software Tools
Topic: The problem about multidirectional sea stated with second order force
Replies: 1
Views: 85

Re: The problem about multidirectional sea stated with second order force

Dear JiYuan, This is indeed an error in the code ( https://github.com/OpenFAST/openfast/issues/9 ). The sign in the comparison with WaveDirMax is incorrect in lines 922, 979, 979, 993, 1379, 1393, 1436, 1450, 1928, 1942, 2365, and 2379 of the WAMIT2.f90 file. Line 922 should read: IF ( InitInp%WaveD...
by Andy.Platt
Wed Dec 09, 2020 2:06 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Free decay analysis and natural frequency
Replies: 49
Views: 9213

Re: Free decay analysis and natural frequency

Dear Simone, I forgot to mention that I did modify the twist distribution. I set the first 6 keypoints to a twist of 42.8040 degrees (same as keypoint #6 originally). This really isn't a good fit either and won't be well represented by the Legendre Spectral elements either due to the discontinuity. ...
by Andy.Platt
Mon Dec 07, 2020 12:58 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Free decay analysis and natural frequency
Replies: 49
Views: 9213

Re: Free decay analysis and natural frequency

Dear Simone, I noticed a couple of things in your input files. First, the timestep in the main .fst file is too large for a simulation using BeamDyn. I would expect this to be on the order of 0.0025 seconds or smaller. This may be causing numerical instability in the coupling of BeamDyn to ElastoDyn...
by Andy.Platt
Tue Oct 20, 2020 9:16 am
Forum: Computer-Aided Engineering Software Tools
Topic: Problems with avcMsg
Replies: 4
Views: 353

Re: Problems with avcMsg

Hi Anish,

Glad you found the source of the issue.

Thanks for letting us know what the root cause. It's good to know that a dangling pointer could cause this issue.

Cheers,
Andy
by Andy.Platt
Tue Oct 13, 2020 3:10 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Problems with avcMsg
Replies: 4
Views: 353

Re: Problems with avcMsg

Does any of your intended message appear, or is it all junk? This appears like some argument isn't aligning at the interface. The content of the error message looks a bit like it might a garbled form of the avcOUTNAME argument. Can you share the interface info from the procedure in the DLL? Alternat...
by Andy.Platt
Tue Jan 21, 2020 11:48 am
Forum: Structural Analysis
Topic: Comparison between ElastoDyn and BeamDyn
Replies: 13
Views: 3135

Re: Comparison between ElastoDyn and BeamDyn

Hi Moritz, I ran a quick check of the NREL 5MW model at 24 m/s wind speed. For this check, the only change from the standard regression tests was the wind (current dev branch, git hash a51fffaa). I set the wind to 24 m/s at hub height with 0.2 for the power law exponent. The cone angle, shaft tilt, ...
by Andy.Platt
Mon Jan 13, 2020 2:38 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Second order file WaveDir boundary check issue
Replies: 4
Views: 2556

Re: Second order file WaveDir boundary check issue

Dear Romain, Thanks for the summary on the issue. You are correct that the wrong sign was used in the checks for WaveDirMax (this appears to have been a copy / paste error when I was developing the module). This has been corrected in the branch that is under development that will allow flexible floa...
by Andy.Platt
Mon Jan 13, 2020 8:46 am
Forum: Structural Analysis
Topic: Comparison between ElastoDyn and BeamDyn
Replies: 13
Views: 3135

Re: Comparison between ElastoDyn and BeamDyn

Dear Moritz, I think this makes sense. The simulation is close to rated power which I expect will produce the largest torsional moment along the blade. ElastoDyn does not have any torsional degree of freedom, so the tip does not twist relative to the root. Therefore in the ElastoDyn simulation, the ...
by Andy.Platt
Thu Jan 09, 2020 10:05 am
Forum: Structural Analysis
Topic: Comparison between ElastoDyn and BeamDyn
Replies: 13
Views: 3135

Re: Comparison between ElastoDyn and BeamDyn

Dear Moritz, From the second plot of the RootMx, it looks like the two simulations are at different azimuth angle at 350 seconds. In that case we would expect the blade spanwise loading to be different. Do you see differences in the spanwise loading if you investigate at a time when the azimuths ali...
by Andy.Platt
Mon Nov 12, 2012 12:43 pm
Forum: News and Announcements
Topic: Software Releases
Replies: 17
Views: 106164

Updated version of WT_Perf (v3.05.00a-adp)

We are happy to announce a new release of WT_Perf (v3.05.00a-adp), a wind turbine perfomance evaluator based on using BEM theory. New features and changes included in this release: - Modification of the solver for better convergence - Improved control of the solver through the addition of the NSplit...

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