Search found 25 matches

by Mustafa.Vardaroglu
Thu May 06, 2021 9:57 am
Forum: Inflow Turbulence
Topic: TURBSIM wind field discontinuity
Replies: 9
Views: 193

Re: TURBSIM wind field discontinuity

Dear Jason, Thank you as always for your help. 1-You have the point. Previously "SCMod1", "SCMod2" and "SCMod1" were all set to "IEC". When I set all the three parameters to "NONE", wind field u-component changes drastically but have not noticed any ...
by Mustafa.Vardaroglu
Thu May 06, 2021 7:06 am
Forum: Inflow Turbulence
Topic: TURBSIM wind field discontinuity
Replies: 9
Views: 193

Re: TURBSIM wind field discontinuity

Dear Jason & Dear All, I would like to ask your opinion about the plots I shared here previously (April 25). I see wind speed differences between each square in v-component (also w) of the wind field. Though the extreme values are lower than u-component extremes in the colorbar, seeing next to e...
by Mustafa.Vardaroglu
Sun Apr 25, 2021 11:11 am
Forum: Inflow Turbulence
Topic: TURBSIM wind field discontinuity
Replies: 9
Views: 193

Re: TURBSIM wind field discontinuity

Dear Jason, Thanks a lot for sharing your time and help. I used the "readfile_BTS " script with "FFwind_figure" script (https://wind.nrel.gov/forum/wind/viewtopic.php?f=4&t=2241&p=14447&hilit=readfile_BTS#p14447) to visualize the turbulent wind field. Attached figures...
by Mustafa.Vardaroglu
Fri Apr 23, 2021 3:39 pm
Forum: Inflow Turbulence
Topic: TURBSIM wind field discontinuity
Replies: 9
Views: 193

Re: TURBSIM wind field discontinuity

Dear Jason,

Thanks a lot for your help and your time. My apologies for the lack of input file. Its available now. I'll check the MATLAB-based reader output and update here.

Sincerely,
Mustafa
by Mustafa.Vardaroglu
Fri Apr 23, 2021 2:52 pm
Forum: Inflow Turbulence
Topic: TURBSIM wind field discontinuity
Replies: 9
Views: 193

TURBSIM wind field discontinuity

Dear All, I am trying to generate a turbulent wind field at rated wind speed on the NREL 5MW reference wind turbine by using TURBSIM. I am able to run the analysis and visualize the wind field output by using QBlade. When I check the wind field, I see a horizontal layer of discontinuity which elevat...
by Mustafa.Vardaroglu
Thu Sep 17, 2020 2:22 pm
Forum: Computer-Aided Engineering Software Tools
Topic: AeroDyn and FAST
Replies: 8
Views: 4257

Re: AeroDyn and FAST

[size=100]Dear All, I am trying to obtain the hydrodynamic coefficients (added mass, radiation damping), first order wave excitation force (magnitude and the phase angle) of MIT/NREL TLP by using NEMOH panel method solver. I am attaching my results where I compared : - NEMOH solution (Blue data ser...
by Mustafa.Vardaroglu
Tue Oct 29, 2019 11:17 am
Forum: Computer-Aided Engineering Software Tools
Topic: Free decay analysis and natural frequency
Replies: 49
Views: 11154

Re: Free decay analysis and natural frequency

Dear All & Dear Jason, Description: I would like to expand the discussion to MIT NREL TLP analysis with MoorDyn. In the FAST directory, I can't see the MoorDyn code. Has anyone tried on that before? I understand that MoorDyn is based on a lumped-mass approach which is capable of modelling the mo...
by Mustafa.Vardaroglu
Fri Oct 11, 2019 10:46 am
Forum: Computer-Aided Engineering Software Tools
Topic: Free decay analysis and natural frequency
Replies: 49
Views: 11154

Re: Free decay analysis and natural frequency

Dear Jason & Dear All, 1) Is there any reference value for the damping ratio values from free decay analysis of MIT NREL TLP? I've checked Matha (2009) but I can not see. 2) I am checking the hydrodynamic solution method (potential flow or strip theory or both) of the MIT/NREL TLP from the "...
by Mustafa.Vardaroglu
Thu Oct 03, 2019 10:07 am
Forum: Structural Analysis
Topic: Tower Eigenfrequencies of NREL 5MW Turbine
Replies: 60
Views: 63805

Re: Tower Eigenfrequencies of NREL 5MW Turbine

Dear Jason & Dear All, I am working on the MIT NREL TLP model, which is readily available in Model #23 of FAST. As we know that pitch response and tower bending response of the structure is coupled. I want to obtain the pure pitch frequency of the structure. To get that, I switch TwFADOF1, TwFAD...
by Mustafa.Vardaroglu
Tue Sep 17, 2019 11:06 am
Forum: Computer-Aided Engineering Software Tools
Topic: fore-aft and side-to-side accelerations at mid-tower
Replies: 7
Views: 3257

Re: fore-aft and side-to-side accelerations at mid-tower

Dear Mustafa, Yes, you can use ElastoDyn outputs TwHt*TDxt, TwHt*TDyt, and TwHt*TDzt to get the xt, yt, and zt displacements, respectively, at up to 9 output nodes along the tower, where * is between 1 and 9. Best regards, Dear Jason, Thanks a lot for your time and help... Sincerely, Mustafa Vardar...
by Mustafa.Vardaroglu
Tue Sep 17, 2019 11:05 am
Forum: Computer-Aided Engineering Software Tools
Topic: Natural Frequencies with FAST v8
Replies: 10
Views: 11839

Re: Natural Frequencies with FAST v8

Jason.Jonkman wrote:Dear Mustafa,

Instead of providing a unit impulse, you can set an initial tower-top displacement (in the ElastoDyn module) to conduct a free-decay test of the tower oscillation.

Best regards,


Dear Jason,

Thanks a lot for your time and help...

Sincerely,
Mustafa Vardaroglu
by Mustafa.Vardaroglu
Tue Sep 17, 2019 4:48 am
Forum: Computer-Aided Engineering Software Tools
Topic: fore-aft and side-to-side accelerations at mid-tower
Replies: 7
Views: 3257

Re: fore-aft and side-to-side accelerations at mid-tower

Dear Jason, I am trying to see the horizontal displacements along the z-axis. "TTDspFA" parameter from ElastoDyn gives the displacement of the tower top, in the fore aft direction. I am aware that it is possible to get the bending moments along the tower by specifying node numbers to "...
by Mustafa.Vardaroglu
Tue Sep 17, 2019 4:39 am
Forum: Computer-Aided Engineering Software Tools
Topic: Natural Frequencies with FAST v8
Replies: 10
Views: 11839

Re: Natural Frequencies with FAST v8

Dear Jason,

In addition to the platform natural frequencies, is there a way to conduct a free decay test on tower oscillations? Such as an application of unit impulse to the tower?

Sincerely,
Mustafa Vardaroglu
by Mustafa.Vardaroglu
Thu Sep 12, 2019 7:50 am
Forum: Computer-Aided Engineering Software Tools
Topic: MIT/NREL TLP
Replies: 8
Views: 7979

Re: MIT/NREL TLP

Dear Jason, Matha et al. (2009) " Model Development and Loads Analysis of an Offshore Wind Turbine on a Tension Leg Platform, with a Comparison to Other Floating Turbine Concepts", Table 6. gives 0.6311 Hz for the 1st Tower F-A natural frequency of the MIT NREL TLP Final design. Jonkman et...
by Mustafa.Vardaroglu
Thu Feb 21, 2019 2:51 am
Forum: Computer-Aided Engineering Software Tools
Topic: MIT/NREL TLP without wind
Replies: 6
Views: 1878

Re: MIT/NREL TLP without wind

Dear Jason, Thanks for your help. I execute the FAST code in MATLAB by simply running: command_3=('FAST_x64 Test23.fst') [status,cmdout] = system(command_3) Once the FAST terminates normally, I immediately call the ReadFASTbinary function: r=ReadFASTbinary('Test23.outb') Sorry for taking your time. ...

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