Search found 32 matches

by Yajun.Ren
Sun Jul 05, 2020 9:16 am
Forum: Computer-Aided Engineering Software Tools
Topic: DTU 10-MW Reference Wind Turbine
Replies: 65
Views: 27211

Re: DTU 10-MW Reference Wind Turbine

Dear all, I am using the ROSCO controller to simulate a floating wind turbine. According to the above discussions, I downloaded the controller files DISCON_IEA_offshore, IEA-10.0-198-RWT_DISCON.IN and IEA-10.0-198-RWT_Cp_Ct_Cq.txt, applied them in the ServoDyn file and ran the simulation. The questi...
by Yajun.Ren
Thu Jun 25, 2020 5:26 am
Forum: Structural Analysis
Topic: hydrodynamic model for semisubmersible FOWT
Replies: 10
Views: 2281

Re: hydrodynamic model for semisubmersible FOWT

Dear Lixian, HydroDyn expects the hydrodynamic coefficients for the potential-flow solution to be defined about the WAMIT reference point, which is (0,0,0). And the pitch and roll restoring associated with the center of mass of the floating wind turbine are intrinsically accounted for in the Elasto...
by Yajun.Ren
Thu Jun 04, 2020 2:28 pm
Forum: Structural Analysis
Topic: Simulation errors of MIT NREL TLP (Test 23)
Replies: 1
Views: 120

Simulation errors of MIT NREL TLP (Test 23)

Dear all, I was trying to run the simulation using Test 23 files and got some problems. I used the environmental condition used for model validation in https://www.nrel.gov/docs/fy10osti/45891.pdf (Denis's PhD thesis): 11 m/s hub-height wind speed, 10-m significant wave height and Tp of 17.64s. Base...
by Yajun.Ren
Tue May 19, 2020 5:48 am
Forum: Structural Analysis
Topic: Modelling of a 10MW FOWT
Replies: 5
Views: 256

Re: Modelling of a 10MW FOWT

Dear Jason, I would like to add two more questions: I am not quite understand how you determine the value PtfmVol0 in HydroDyn. According to the manual, it is defined based on the result of WAMIT simulation. However when I checked the WAMIT output file published here https://rwt.windenergy.dtu.dk/na...
by Yajun.Ren
Tue May 19, 2020 3:31 am
Forum: Structural Analysis
Topic: Modelling of a 10MW FOWT
Replies: 5
Views: 256

Re: Modelling of a 10MW FOWT

Dear Jason, Thanks for your reply. No the structure was supposed to stay steady as I disabled AeroDyn, set WaveMod = 0 and the simulation started with the tubine at its undisplaced position. If it was a free decay, the phenomenon is not supposed to continue until the end of simulation (1000s). The i...
by Yajun.Ren
Mon May 18, 2020 10:31 am
Forum: Structural Analysis
Topic: Modelling of a 10MW FOWT
Replies: 5
Views: 256

Modelling of a 10MW FOWT

Dear all, I modelled a 10 MW wind turbine using the FAST input file given in https://rwt.windenergy.dtu.dk/natalia.castro-casas/dtu-10mw-rwt/-/tree/master/aeroelastic_models/fast/DTU10MWRWT_floating_FAST_v1.00/DTU10MWRWT_NAUTILUS_GoM_FAST_v1.00 and coupled it with a modified spar platform based on t...
by Yajun.Ren
Mon Nov 18, 2019 4:04 am
Forum: Structural Analysis
Topic: RAO OC3Hywind Turbine
Replies: 34
Views: 9190

Re: RAO OC3Hywind Turbine

Dear Jason, Thanks for your reply, now I am clear with the time step. My additional question is that, in the paper 'Investigation of Response Amplitude Operators for Floating Offshore Wind Turbines', the turbine is modelled as both 'flexible' and 'rigid' turbine, is the difference between these two ...
by Yajun.Ren
Thu Nov 14, 2019 3:46 am
Forum: Structural Analysis
Topic: RAO OC3Hywind Turbine
Replies: 34
Views: 9190

Re: RAO OC3Hywind Turbine

Dear Jason, I realised the reason I got the above results is that I disabled all the DOFs except for surge,sway,heave,roll,pitch and yaw in ElastoDyn. The part of input file was set as: ---------------------- DEGREES OF FREEDOM -------------------------------------- False FlapDOF1 - First flapwise b...
by Yajun.Ren
Wed Nov 06, 2019 2:31 pm
Forum: Structural Analysis
Topic: RAO OC3Hywind Turbine
Replies: 34
Views: 9190

Re: RAO OC3Hywind Turbine

Dear Yingyi I only took a brief look at your script; it looks like pxx and pxy are different sizes; once you fix that and make them the same size, you would need to use a element-by-element divide (./) rather than a matrix divide (/). I don't have the time to update your script for your. However, I...
by Yajun.Ren
Wed Oct 16, 2019 7:52 am
Forum: Rotor Aerodynamics
Topic: Turbine shut down operation
Replies: 16
Views: 2499

Re: Turbine shut down operation

Dear Jason,

That works. Thank you very much for your kind help.

Best regards,
Yajun
by Yajun.Ren
Tue Oct 15, 2019 7:21 am
Forum: Rotor Aerodynamics
Topic: Turbine shut down operation
Replies: 16
Views: 2499

Re: Turbine shut down operation

Dear Jason,

The total simulation is 8000s, and the rotor speed is unchanged until the end of the simulation.

Best regards,
Yajun
by Yajun.Ren
Tue Oct 15, 2019 7:04 am
Forum: Rotor Aerodynamics
Topic: Turbine shut down operation
Replies: 16
Views: 2499

Re: Turbine shut down operation

Dear Jason, I did set the input file using the above settings and the output shows that the rotor speed is unchanged after the shut down. The generator torque reduces to 0 after 1000s which looks correct. In this situation I think the generator stops to produce power, but the blades are still rotati...
by Yajun.Ren
Tue Oct 15, 2019 6:46 am
Forum: Rotor Aerodynamics
Topic: Turbine shut down operation
Replies: 16
Views: 2499

Re: Turbine shut down operation

Sorry I actually set TimGenOn = 0 and TimGenOf = 1000. I wanted to stop the turbine from 1000s.
by Yajun.Ren
Tue Oct 15, 2019 4:34 am
Forum: Rotor Aerodynamics
Topic: Turbine shut down operation
Replies: 16
Views: 2499

Re: Turbine shut down operation

Dear Jason, Thanks for your reply. For the first question, here is the setting of the torque control: VSContrl = 5, GenModel = 2, GenTiStr = True, GenTiStp = True, TimGenOn = 1000 (TPitManS) I can't find anything wrong with this, could you suggest if there is any other setting I should notice? For t...
by Yajun.Ren
Mon Oct 14, 2019 4:35 am
Forum: Rotor Aerodynamics
Topic: Turbine shut down operation
Replies: 16
Views: 2499

Re: Turbine shut down operation

Dear Jason, I have a further question regarding to this problem. When I ran the simulation with the above setting, I can see the blade was pitched to 90 degree from the time that the turbine was supposed to be parked and the aerodynamic loading was obviously reduced. However, the RotSpeed was unchan...

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