Search found 21 matches

by Abhinay.Goga
Tue Jul 07, 2020 4:21 am
Forum: Computer-Aided Engineering Software Tools
Topic: DTU 10-MW Reference Wind Turbine
Replies: 65
Views: 28092

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: 65
Views: 28092

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: 65
Views: 28092

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: 65
Views: 28092

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: 10646

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: 10646

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: 10646

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: 10646

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: 10646

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: 12993

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: 10646

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...
by Abhinay.Goga
Fri Jun 12, 2020 3:41 am
Forum: Computer-Aided Engineering Software Tools
Topic: Tendon failure in FAST modeling
Replies: 47
Views: 10646

Re: Tendon failure in FAST modeling

Dear Jason and all, I am trying to implement a transitional event of mooring line loss for DTU 10MW floating model. Based on the inputs from this discussion I have tried to modify the source code for MoorDyn but the result is not as expected. Could anyone correct me where I am going wrong? P.S. Rela...
by Abhinay.Goga
Mon May 25, 2020 2:19 am
Forum: Computer-Aided Engineering Software Tools
Topic: DTU 10-MW Reference Wind Turbine
Replies: 65
Views: 28092

Re: DTU 10-MW Reference Wind Turbine

Dear Jason and all, LIFES50+ D1.2 states that, AeroDynv14 calculates the unsteady aerodynamics at fixed initial position rather with the moving tower. For a floating wind turbine the tower moves along with the floater and initial position for aerodynamics calculation is actually a frame of reference...
by Abhinay.Goga
Thu May 21, 2020 4:34 am
Forum: Structural Analysis
Topic: Modelling of a 10MW FOWT
Replies: 5
Views: 355

Re: Modelling of a 10MW FOWT

Dear Yajun, The free decay motions that you are experiencing could be because of the initial platform displacements given in the ElastoDyn. Try to verify static condition with all initial displacements zero. If the outputs of platform displacements are having non-zero values means the coupled struct...
by Abhinay.Goga
Thu May 21, 2020 3:51 am
Forum: Computer-Aided Engineering Software Tools
Topic: Surface visualization of DTU-10 MW
Replies: 4
Views: 1033

Re: Surface visualization of DTU-10 MW

Dear Ghaith and Jason,

Correct me If I'm wrong. Surface visualization is possible only with AeroDynV15. Where as the github repository doesn't contain AeroDynV15 inputs.
Is there any updated files for the structure? Any suggestion on this are appreciated.

Kind regards
Abhinay Goga

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