Search found 40 matches

by Abhinay.Goga
Wed Sep 16, 2020 3:48 am
Forum: Computer-Aided Engineering Software Tools
Topic: The prebent blade and aerodyn15
Replies: 33
Views: 4971

Re: The prebent blade and aerodyn15

Dear Jason, With the insights from previous threads on Natural frequencies, using MBC3 script I have calculated the natural frequencies. Parked DLC with exclusion of Aero and Inflow(Only Elasto, Beam and Servo activated), and the linearization performed for debug (all inputs, outputs & inclusion...
by Abhinay.Goga
Tue Sep 15, 2020 3:44 am
Forum: Computer-Aided Engineering Software Tools
Topic: The prebent blade and aerodyn15
Replies: 33
Views: 4971

Re: The prebent blade and aerodyn15

Dear Jason, I am facing exactly the same issue of convergence for some simulations, with OpenFASTv2.3.0 and a time step of 0.0001s ''FAST_Solution:FAST_AdvanceStates:B1:BD_GA2:BD_DynamicSolutionGA2:Solution does not converge after the maximum number of iterations FAST encountered an error at simulat...
by Abhinay.Goga
Mon Sep 14, 2020 12:11 am
Forum: Computer-Aided Engineering Software Tools
Topic: The prebent blade and aerodyn15
Replies: 33
Views: 4971

Re: The prebent blade and aerodyn15

Dear Jason, Thanks for the insights. I will use caution while working with BeamDyn. Could you please explain or guide me to a thread where I can learn more about this bug that you mentioned. My present aim is to work with a prebent blade. The Stiffness matrix of the blade sections are well defined a...
by Abhinay.Goga
Fri Sep 11, 2020 6:40 am
Forum: Computer-Aided Engineering Software Tools
Topic: The prebent blade and aerodyn15
Replies: 33
Views: 4971

Re: The prebent blade and aerodyn15

Dear Jason and all, Currently I am working on an onshore turbine with prebent rotor using ElastoDyn+BeamDyn. For the convergence issue, I kept the glue code time step as 0.0001 and its taking a humongous amount of time. Is there any possible ways to reduce the simulation time while coupled with Beam...
by Abhinay.Goga
Tue Jul 07, 2020 4:21 am
Forum: Computer-Aided Engineering Software Tools
Topic: DTU 10-MW Reference Wind Turbine
Replies: 81
Views: 40604

Re: DTU 10-MW Reference Wind Turbine

Dear Jason,

Thanks for correcting me. The code that Mr.Matt provided with single precision also provided a stable numerical output.

Kind regards
Abhinay Goga
by Abhinay.Goga
Mon Jul 06, 2020 2:10 am
Forum: Computer-Aided Engineering Software Tools
Topic: DTU 10-MW Reference Wind Turbine
Replies: 81
Views: 40604

Re: DTU 10-MW Reference Wind Turbine

Dear Matt,

Thanks for the source code and suggestion to recompile with double precision. As expected it took tremendous amount of simulation time with double precision. Though its worth it. As you can observe there isn't any strange behavior on the fairlead tensions.

Kind regards
Abhinay Goga
by Abhinay.Goga
Wed Jul 01, 2020 4:56 am
Forum: Computer-Aided Engineering Software Tools
Topic: DTU 10-MW Reference Wind Turbine
Replies: 81
Views: 40604

Re: DTU 10-MW Reference Wind Turbine

Dear Matt, The previous simulations were performed with FAST v8.16 and dtM 0.001. Following your comments in attached thread, I ran a new simulation with OpenFAST v2.3.0 and increased MoorDyn time step (dtM) to 0.0001. Yet the behavior remains same after 512secs and surprisingly the rise in magnitud...
by Abhinay.Goga
Mon Jun 29, 2020 6:19 am
Forum: Computer-Aided Engineering Software Tools
Topic: DTU 10-MW Reference Wind Turbine
Replies: 81
Views: 40604

Re: DTU 10-MW Reference Wind Turbine

Dear Jason and Matt, For the regular wave simulation on OO-star semi floater there is a strange behavior. A sudden jump in the mooring line tensions (after 512secs) but no effect on platform displacements. LIFES50+ project also mentioned such behavior in their report. Could you explain the cause for...
by Abhinay.Goga
Sat Jun 27, 2020 1:56 am
Forum: Computer-Aided Engineering Software Tools
Topic: Tendon failure in FAST modeling
Replies: 47
Views: 15275

Re: Tendon failure in FAST modeling

Dear Matt,

Understood that the source code you helped with creates a Pseudo event of transient line loss. Thanks for all the guidance and support. For my thesis, the implemented model is suffice. Looking forward to future improvements on the glue codes.

Kind regards
Abhinay Goga
by Abhinay.Goga
Fri Jun 26, 2020 5:10 am
Forum: Computer-Aided Engineering Software Tools
Topic: Tendon failure in FAST modeling
Replies: 47
Views: 15275

Re: Tendon failure in FAST modeling

Dear Jason and Matt, Thanks. The floater is OlavOlsen Semi-submersible star floater. My aim is to validate fiber ropes instead of conventional catenary chains. My connections of lines look like the following: "Line LineType UnstrLen NumSegs NodeAnch NodeFair Flags/Outputs (-) (-) (m) (-) (-) (-...
by Abhinay.Goga
Thu Jun 25, 2020 6:39 am
Forum: Computer-Aided Engineering Software Tools
Topic: Tendon failure in FAST modeling
Replies: 47
Views: 15275

Re: Tendon failure in FAST modeling

Dear Bonnie and Matt, Thanks for guidance. With configuring the properties to release,the recompilation is successful. The Fairlead tension for line 1 after 50 sec reaches zero, yet there are are no significant rise in the loads for remaining lines. And in the mooring file, I have designed 9 lines (...
by Abhinay.Goga
Wed Jun 24, 2020 1:55 am
Forum: Computer-Aided Engineering Software Tools
Topic: Tendon failure in FAST modeling
Replies: 47
Views: 15275

Re: Tendon failure in FAST modeling

Dear Bonnie, Thanks for the input. Based on the suggestion, I have removed the word ABSTRACT from line 106. The errors changed into somewhat different this time. Any guidance would be helpful. P.S. Facing an http error to attach text document. "Severity Code Description Project File Line Suppre...
by Abhinay.Goga
Sun Jun 21, 2020 6:10 am
Forum: Computer-Aided Engineering Software Tools
Topic: Tendon failure in FAST modeling
Replies: 47
Views: 15275

Re: Tendon failure in FAST modeling

Dear Matt and Jason,

Thanks for the assistance. While recompiling FAST v8 using Visual studio there are errors and few warnings .
I just changed the source code as suggested in dependencies/MoorDyn.
Any assistance with resolving these would be appreciated.

Thanks and reagards
Abhinay Goga
by Abhinay.Goga
Wed Jun 17, 2020 3:03 am
Forum: Computer-Aided Engineering Software Tools
Topic: MLife Fatigue DEL Calculation
Replies: 31
Views: 17275

Re: MLife Fatigue DEL Calculation

Dear Jason,

I couldn't access the NREL tools MLife and MExtreme on the new website. The link you have previously attached in this thread is also not working. Is there any repository to access those tools? Can I use those tools without Matlab source as well?

Thanks and reagrds
Abhinay Goga
by Abhinay.Goga
Sun Jun 14, 2020 3:39 am
Forum: Computer-Aided Engineering Software Tools
Topic: Tendon failure in FAST modeling
Replies: 47
Views: 15275

Re: Tendon failure in FAST modeling

Dear Matt, Yes. The main objective is to call zero tension on one fairlead after certain run time to make it perform like line loss. After going through the thread that you have attached, now I understood that Fairlead nodal positions and loads are called from subroutine DoLineRHS. With my limited k...

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