Search found 51 matches

by Akheel.Kodambiyakamkizhakkakam
Wed Nov 11, 2020 9:00 pm
Forum: General
Topic: openfast v2.3
Replies: 20
Views: 2659

Re: openfast v2.3

Dear Sir, I referred the paper 'Coupled modeling and structural vibration control for floating offshore wind turbine' by Yang et. al, 2020. I plotted the time series for surge under (load case 2 in the paper, Fig 16.a). I have attached a word file in which I have compared surge time series I obtaine...
by Akheel.Kodambiyakamkizhakkakam
Wed Nov 11, 2020 6:43 pm
Forum: Structural Analysis
Topic: NREL 5MW OC3-Hywind (Test 24) Questions
Replies: 78
Views: 13249

Re: NREL 5MW OC3-Hywind (Test 24) Questions

Dear Jonkman,
In my previous query, By 'inertial coordinates', I meant the inertial frame. And my query was that if I want to change the inrtial frame to platform COG, Do I need to recompile or setting PtfmRefzt = 89.9 alone is sufficient?

Thanks
by Akheel.Kodambiyakamkizhakkakam
Sat Nov 07, 2020 6:42 am
Forum: Structural Analysis
Topic: NREL 5MW OC3-Hywind (Test 24) Questions
Replies: 78
Views: 13249

Re: NREL 5MW OC3-Hywind (Test 24) Questions

Hey,
1. Does the hub mass (56780) given in ElastoDyn includes the mass of 3 blades?
2. What all changes do I need to make if try to model RNA as a lumped mass?
3. Do I need to recompile OpenFAST if I want to change the inertial coordinates? Or Changing PtfmRefzt alone is sufficient?
by Akheel.Kodambiyakamkizhakkakam
Fri Nov 06, 2020 10:09 pm
Forum: General
Topic: openfast v2.3
Replies: 20
Views: 2659

Re: openfast v2.3

Dear sir, I copied files from r-test to a new folder and input values such as wave height, time period in HydroDyn and .bts file location in Inflow wind file. I used TurbSim to get the .bts file. Wave height, Time period, wind speed and turbulence intensity were the only data which were available fr...
by Akheel.Kodambiyakamkizhakkakam
Fri Nov 06, 2020 9:24 am
Forum: General
Topic: openfast v2.3
Replies: 20
Views: 2659

Re: openfast v2.3

Hello everyone, I have been trying to simulate the forced vibration response for past few weeks. The inputs were given based on a paper which includes: wave spectrum (PM), significant wave height, wave period, wind spectrum (KAIMAL), wind velocity at hub, turbulence intensity. I have tried several c...
by Akheel.Kodambiyakamkizhakkakam
Mon Oct 26, 2020 4:53 am
Forum: General
Topic: openfast v2.3
Replies: 20
Views: 2659

Re: openfast v2.3

Dear Sir,
Thanks for the response. This message is based on your answer to question 3. If I am simulating no wind condition, Do I need to input CompInflow = 1?
by Akheel.Kodambiyakamkizhakkakam
Fri Oct 23, 2020 9:08 am
Forum: General
Topic: openfast v2.3
Replies: 20
Views: 2659

Re: openfast v2.3

Hello, I need some clarification regarding OpenFAST 1. What is the difference between CompAero and CompInflow in .fst file? 2. Where is wind force being applied (along the tower or at the hub alone)? 3. I tried to simulate forced vibration with no wind condition. So, I made CompAero = 0, CompInflow ...
by Akheel.Kodambiyakamkizhakkakam
Fri Oct 16, 2020 9:07 am
Forum: Computer-Aided Engineering Software Tools
Topic: Suggestions for compiling FAST v8
Replies: 8
Views: 1318

Re: Suggestions for compiling FAST v8

Dear Jason,
Thank you sir. I could find a lot of journals with TMD in platform. Does any previous version of FAST has TMD in platform enabled?
by Akheel.Kodambiyakamkizhakkakam
Fri Oct 16, 2020 8:32 am
Forum: Computer-Aided Engineering Software Tools
Topic: Suggestions for compiling FAST v8
Replies: 8
Views: 1318

Re: Suggestions for compiling FAST v8

Dear sir, I am a user of OpenFAST. I downloaded the precompiled binaries. I want to model TMD in platform. Is '_ServoDyn_TMD.dat' file itself is used for the purpose( confused whether it is for nacelle alone from the file name). Also, I am not able to locate 'CompTTMD' flag in my .fst file. Thanks i...
by Akheel.Kodambiyakamkizhakkakam
Sat Oct 03, 2020 8:34 pm
Forum: Rotor Aerodynamics
Topic: Unsteady Aerodynamics Turning Off
Replies: 5
Views: 1186

Re: Unsteady Aerodynamics Turning Off

Dear Sir,
Why would this warning pop-up even when the UACutOut is default.
Thanks in advance
by Akheel.Kodambiyakamkizhakkakam
Mon Sep 28, 2020 10:40 pm
Forum: Structural Analysis
Topic: NREL 5MW OC3-Hywind (Test 24) Questions
Replies: 78
Views: 13249

Re: NREL 5MW OC3-Hywind (Test 24) Questions

Thank you sir
By forced vibration, I meant that the structure is subjected to external forces like wind and wave.
by Akheel.Kodambiyakamkizhakkakam
Mon Sep 28, 2020 10:36 pm
Forum: General
Topic: Coordinate System
Replies: 2
Views: 496

Re: Coordinate System

Adding to the above, I would like to whether my understandings are correct or not regarding OpenFAST coordinate system. Help me if I am wrong. 1. Inertial coordinate system origins at the bottom of spar. 2. The platform (6 DOFs) responses calculated in OpenFAST are the responses at the platform COG ...
by Akheel.Kodambiyakamkizhakkakam
Mon Sep 28, 2020 10:18 pm
Forum: General
Topic: Coordinate System
Replies: 2
Views: 496

Coordinate System

Dear OpenFAST team,
I would like to know whether the coordinate system used in OpenFAST is the same as the one in 'FAST Users Guide' released in August 2005

Many thanks to the team
by Akheel.Kodambiyakamkizhakkakam
Mon Sep 28, 2020 7:59 am
Forum: General
Topic: Error message
Replies: 3
Views: 2231

Re: Error message

Dear All, I found an error as below while running OpenFAST under Forced Vibration. What would be the reason. Can Someone help me to fix this? G:\OpenFAST\Unzipped\openfast-2.3.0\Trial 2>"openfast_x64.exe" "5MW_OC3Spar_DLL_WTurb_WavesIrr.fst" OpenFAST Copyright (C) National Renewa...
by Akheel.Kodambiyakamkizhakkakam
Sun Sep 27, 2020 10:40 am
Forum: Structural Analysis
Topic: NREL 5MW OC3-Hywind (Test 24) Questions
Replies: 78
Views: 13249

Re: NREL 5MW OC3-Hywind (Test 24) Questions

Hello,
With respect which location are the platform DOFs (Surge, Sway, Heave, Roll, Pitch, Yaw) presented for OC3 Hywind Platform under forced vibration in OpenFAST? Is it the response at the COG or at the platform top?

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