Search found 26 matches

by Florence.Haudin
Tue Feb 16, 2021 2:21 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Mode shapes
Replies: 8
Views: 443

Re: Mode shapes

Hi Jason,
Sorry just after sending my post I realized that having b different from 1 in MaNbTDXss is a non-sense when NoutCnt is 1.
So now I can get the outputs from Subdyn. Sorry for that confusion.
Best regards.
Florence Haudin.
by Florence.Haudin
Tue Feb 16, 2021 12:34 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Mode shapes
Replies: 8
Views: 443

Re: Mode shapes

Hi Jason, Thanks for your answer For Elastodyn I think that my format for TwrGagNd was indeed not correct. In my previous not working file, only gave 1 node number forTwrGagNd (I thought it was a number of elements and not a list of nodes). Nevertheless I am not very sure of the format of the list o...
by Florence.Haudin
Mon Feb 15, 2021 9:42 am
Forum: Computer-Aided Engineering Software Tools
Topic: Mode shapes
Replies: 8
Views: 443

Re: Mode shapes

Hi Jason, Thanks for you reply. For Elastodyn, if NTwGages is set different to 1 I can't run simulations (there is an error message : "Invalid numerical input for file "ElastoDyn.dat" occurred while trying to read TwrGagNd".). I want to use the maximum number of probes (i.e. 9 it...
by Florence.Haudin
Thu Feb 11, 2021 9:04 am
Forum: Computer-Aided Engineering Software Tools
Topic: Mode shapes
Replies: 8
Views: 443

Re: Mode shapes

Hi Jason, Many thanks for your reply. I guess you mean TwHt*TDx in your answer when refering to TwHt*TPxi ? I have a bit naïve question about getting the mode shapes from the deflection in different nodes (combining outputs from Elastodyn and Subdyn). To get the mode shapes (let's say fore-aft modes...
by Florence.Haudin
Thu Feb 04, 2021 3:30 am
Forum: Computer-Aided Engineering Software Tools
Topic: Mode shapes
Replies: 8
Views: 443

Mode shapes

Good morning, I have a quick question regarding mode shapes for a fixed bottom offshore wind turbine. Is it possible with Openfast using appropriate probes to get the mode shape of a system considering tower+substructure. For the tower in Elastodyn I thought about using the probes TwHtiTDx and TwHti...
by Florence.Haudin
Fri Jan 08, 2021 10:45 am
Forum: Computer-Aided Engineering Software Tools
Topic: Bmodes download
Replies: 24
Views: 2928

Bmodes question linked to Elastodyn/Subdyn

Hi Jason, I asked some questions about Bmodes some time ago. At some point you wrote me this answer : "Yes, you can use hydro_K or mooring_K in BModes_JJ to represent the lumped (coupled springs, CS) stiffness of the foundation of the tower + monopile. But please keep in mind that hydro_K and m...
by Florence.Haudin
Thu Sep 10, 2020 6:33 am
Forum: Computer-Aided Engineering Software Tools
Topic: Subdyn outputs for specific members and nodes
Replies: 1
Views: 872

Subdyn outputs for specific members and nodes

Good afternoon,
I have questions regarding subdyn outputs when referring to specific members and nodes.
My questions are formulated in the attached file relying on a given example because it countains some pictures.
Many thanks in advance.
Best regards.
Florence Haudin.
by Florence.Haudin
Thu Aug 06, 2020 10:54 am
Forum: Computer-Aided Engineering Software Tools
Topic: Bmodes download
Replies: 24
Views: 2928

Re: Bmodes download

Thanks Jason, I calculated the bending modes with Bmodes and the different coefficients of the 6th order polynomial with ModeShapePolyFitting. I then copied the coefficients in the mode shape section of the Elastodyn Tower file. But when I tried to run the simulation I got the following error messag...
by Florence.Haudin
Thu Aug 06, 2020 10:12 am
Forum: Computer-Aided Engineering Software Tools
Topic: Applying a torque at the tower top
Replies: 1
Views: 472

Applying a torque at the tower top

Good afternoon, I would like to investigate the torsional mode of a tower + monopile (asked in OC6 phase 2). As explained to me, OpenFAST includes a lumped stiffness at the yaw to reproduce the proper behavior. To get the torsional mode shape, one advises me to apply a torque at tower top and look a...
by Florence.Haudin
Mon Aug 03, 2020 12:01 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Bmodes download
Replies: 24
Views: 2928

Re: Bmodes download

Thanks Jason, I am brand new with BMode so sorry in advance if my questions are basic. I have 2 questions. I want to have the modes for the system considered in OC6 phase 2, tower + monopile considered as a land-based system. The first one is related to the mooring system stiffness matrix in .bmi fi...
by Florence.Haudin
Tue Jul 28, 2020 5:18 am
Forum: Computer-Aided Engineering Software Tools
Topic: Bmodes download
Replies: 24
Views: 2928

Bmodes download

Good afternoon,
I am wondering where I can download Bmodes.
I could not find a working link.
Thanks in advance.
Best regards.
Florence Haudin.
by Florence.Haudin
Tue Jun 02, 2020 10:07 am
Forum: Computer-Aided Engineering Software Tools
Topic: axial drag
Replies: 1
Views: 491

axial drag

Good afternoon, I have questions concerning the calculation of axial drag in Hydrodyn. I may have missed it but I could not find in the user manual the formula used for the theory. I guess it is is implemented as in "Definition of the Semisubmersible Floating System for Phase II of OC4" pu...
by Florence.Haudin
Mon Apr 27, 2020 3:13 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Hybrid approach
Replies: 5
Views: 937

Re: Hybrid approach

Thanks Jason, So if I move to Openfast for this case, the calculation is possible with axial and transverse drag for the hybrid approach with a forced motion prescribed from a file. Sorry in fact I had not understood before that moving to openfast instead of using hydrodyn in the standalone mode wou...
by Florence.Haudin
Mon Apr 27, 2020 8:59 am
Forum: Computer-Aided Engineering Software Tools
Topic: Hybrid approach
Replies: 5
Views: 937

Re: Hybrid approach

Hi Jason, Thanks for your answer. Things are ok for me now. I am wondering, still in the forced oscillations case, still in an hybrid approach in the WAMITInputsMod equal to 2 , how can I add axial drag on heave plates. As a summary : - I am taking radiation (added mass and convolution term added as...
by Florence.Haudin
Tue Apr 21, 2020 5:29 am
Forum: Computer-Aided Engineering Software Tools
Topic: Hybrid approach
Replies: 5
Views: 937

Hybrid approach

Good afternoon, I have questions concerning the correct way to use an hybrid approach using parts of Hydrodyn calculations to avoid missing or doubling counting effects. I have already asked questions on the topic but I would like to get stronger convictions. The case I want to treat is drag and rad...

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