Search found 23 matches

by Bertrand.Canetti
Fri Nov 29, 2019 1:20 pm
Forum: Computer-Aided Engineering Software Tools
Topic: OC4 Task 30 Phase II Load case 2.1
Replies: 3
Views: 617

Re: OC4 Task 30 Phase II Load case 2.1

Dear Jason,

Thank you for your answer.

Ok, but could you explain why this frequency is not visible in the surge OC4 results for load case 2.1 in the Code Comparison paper, page 8, figure 6?

Image

Best regards,
Bertrand
by Bertrand.Canetti
Thu Nov 28, 2019 10:55 am
Forum: Computer-Aided Engineering Software Tools
Topic: OC4 Task 30 Phase II Load case 2.1
Replies: 3
Views: 617

OC4 Task 30 Phase II Load case 2.1

Dear all, For the load case 2.1, deterministic waves, I have respected the following conditions: - AeroDyn and InflowWind = 0 - ServoDyn = 0 - HydroDyn = 1 with H = 6 m, T = 10 s - Support DOF (platform + tower enabled) And yet, I do obtain a weird slow frequency in my surge response. https://i.ibb....
by Bertrand.Canetti
Thu Nov 28, 2019 1:34 am
Forum: Structural Analysis
Topic: RAO OC3Hywind Turbine
Replies: 34
Views: 8206

Re: RAO OC3Hywind Turbine

Dear Jason,

Thank you for your answer.

Best regards
Bertrand
by Bertrand.Canetti
Thu Nov 28, 2019 1:24 am
Forum: Computer-Aided Engineering Software Tools
Topic: Tendon failure in FAST modeling
Replies: 34
Views: 9102

Re: Tendon failure in FAST modeling

Dear Jason, Thank you for your answer. So to do load case 3.7, I did edit the MAP.F90 source file lie the following: DO i = 1,2 IF (t<100) THEN y%ptFairleadLoad%Force(1,i) = -y%FX(i) y%ptFairleadLoad%Force(2,i) = -y%FY(i) y%ptFairleadLoad%Force(3,i) = -y%FZ(i) ELSE y%ptFairleadLoad%Force(1,i) = 0 y%...
by Bertrand.Canetti
Wed Nov 27, 2019 10:37 am
Forum: Computer-Aided Engineering Software Tools
Topic: Tendon failure in FAST modeling
Replies: 34
Views: 9102

Re: Tendon failure in FAST modeling

Dear Jason, I have never recompiled, but I saw some help about it on the forum. But I wonder, is it simply possible to directly edit FASTv8\Source\dependencies\MAP\MAP.f90 with a text editor (Notepad++)? Also, the tension of the line (between the platform and the fairlead) is actually the tension of...
by Bertrand.Canetti
Wed Nov 27, 2019 8:44 am
Forum: Structural Analysis
Topic: RAO OC3Hywind Turbine
Replies: 34
Views: 8206

Re: RAO OC3Hywind Turbine

Dear Jason, I am slightly confused. Is the auto spectral density and the cross spectral density the equivalent of power spectral densities? For example, would you confirm that: - the wave power spectral density is the same as wave auto spectral density? - the heave power spectral density is the same...
by Bertrand.Canetti
Mon Nov 18, 2019 5:15 pm
Forum: Structural Analysis
Topic: RAO OC3Hywind Turbine
Replies: 34
Views: 8206

Re: RAO OC3Hywind Turbine

Oh...oops.

And yet I did read this message, but did not get it was the same equation... :roll:

Thank you, at least I got it now.

Best regards,
Bertrand
by Bertrand.Canetti
Mon Nov 18, 2019 10:34 am
Forum: Structural Analysis
Topic: RAO OC3Hywind Turbine
Replies: 34
Views: 8206

Re: RAO OC3Hywind Turbine

Dear Yingyi Liu, Here are my answers to your questions: (1) Correct, you should concatenate multiple simulation outputs into a single 1-D array. You can think of "ensemble" as the mean of the outputs. (2) Set WaveMod = 3, WvLowCOff = 0.05*2*pi rad/s, WvHiCOff= 0.25*2*pi rad/s, and WaveHs ...
by Bertrand.Canetti
Sat Nov 16, 2019 12:54 pm
Forum: Computer-Aided Engineering Software Tools
Topic: OC4 Phase II Load case 3.9 Flooded Column
Replies: 5
Views: 781

Re: OC4 Phase II Load case 3.9 Flooded Column

Dear Jason,

Thank you for your answer, I got it now. :)

Best regards,
Bertrand
by Bertrand.Canetti
Sat Nov 16, 2019 5:04 am
Forum: Computer-Aided Engineering Software Tools
Topic: OC4 Phase II Load case 3.9 Flooded Column
Replies: 5
Views: 781

Re: OC4 Phase II Load case 3.9 Flooded Column

Dear Jason, Thank you for your clear answer. Indeed, I made a mistake for the flooding of the base column 1, it should be FillFSLoc = -14.06 m. Though, only column 1 is flooded, so I would let FillFSLoc = -14.89 m for base columns 2 and 3. By the way, do you know why upper column 1 is flooded by thi...
by Bertrand.Canetti
Sat Nov 16, 2019 4:45 am
Forum: Computer-Aided Engineering Software Tools
Topic: Modelling a 4 masts tower
Replies: 2
Views: 599

Re: Modelling a 4 masts tower

Dear Jason,

Thank you for your answer. I did not know this recent paper. I find it very interesting and I am eager to see this new functionality being available in OpenFAST! This is good news to model all the panels of offshore structures.

Thank you again and have a nice day,

Bertrand
by Bertrand.Canetti
Fri Nov 15, 2019 12:53 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Modelling a 4 masts tower
Replies: 2
Views: 599

Modelling a 4 masts tower

Hello everyone, I am wondering how to modify the geometry of the tower to a 4 masts pyramidal-like tower like with the Eolink floating offshore wind turbine project for example? Is there a way to do this with FAST? https://wwz.ifremer.fr/var/storage/images/_aliases/fullsize/medias-ifremer/medias-ins...
by Bertrand.Canetti
Fri Nov 15, 2019 11:56 am
Forum: Computer-Aided Engineering Software Tools
Topic: OC4 Phase II Load case 3.9 Flooded Column
Replies: 5
Views: 781

Re: OC4 Phase II Load case 3.9 Flooded Column

So for the first method, using the geometrical data from the z coordinates of the lowest joints of the base column and upper column members, I have found the following results for the Filled Members part (member 2 is the upper column 1, member 5 is the base column 1): ---------------------- FILLED M...
by Bertrand.Canetti
Fri Nov 15, 2019 11:33 am
Forum: Computer-Aided Engineering Software Tools
Topic: OC4 Phase II Load case 3.9 Flooded Column
Replies: 5
Views: 781

OC4 Phase II Load case 3.9 Flooded Column

Hello everyone, I am trying to reproduce the load case 3.9 of a flooded column from the OC4 Phase II study (document attached). In part 2.3 Full-System Analysis, page 4, there is the description of the 2 methods to model this damage case: 1. directly modelling the additional volume of water in the b...
by Bertrand.Canetti
Tue Nov 12, 2019 12:58 pm
Forum: Computer-Aided Engineering Software Tools
Topic: OC4 Task 30 Phase II: Unstable or Changing the stipulated timesteps.
Replies: 4
Views: 740

Re: OC4 Task 30 Phase II: Unstable or Changing the stipulated timesteps.

Dear Jason,

Oh ok, I was confused between DT wind and DT Aero.

Thank you for your answer.

Best regards
Bertrand

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