Search found 19 matches

by Daniel.Walia
Tue Sep 03, 2019 6:02 am
Forum: Computer-Aided Engineering Software Tools
Topic: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure
Replies: 13
Views: 2259

Re: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure

Dear Jason, thank you for your comments. Your hydro_k and hydro_m matrices seem to match those from your WAMIT output in the attachments. However, the WAMIT output is nondimensional whereas BModes is expecting the data to be dimensional. See the following forum post for information on how to dimensi...
by Daniel.Walia
Thu Aug 29, 2019 8:05 am
Forum: Computer-Aided Engineering Software Tools
Topic: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure
Replies: 13
Views: 2259

Re: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure

Dear Jason, I am still struggling with meeting the expected natural frequencies of our TLP with BModes. From the tank tests we got natural frequencies for our symmetric TLP for Surge and Sway at about 0.0215 Hz. When running a respective decay test in FAST, with strip theory applied in HD, and MoorD...
by Daniel.Walia
Thu Jul 25, 2019 4:33 am
Forum: Computer-Aided Engineering Software Tools
Topic: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure
Replies: 13
Views: 2259

Re: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure

Dear Jason, thank you. It took me a while to come back to your suggestions and answers, as I had some problems to acess the results from our decay tests in the wave tank, in order to answer your questions. And also to dig deeper and understand the relations between the different matrices and their m...
by Daniel.Walia
Wed Jul 03, 2019 3:36 am
Forum: Computer-Aided Engineering Software Tools
Topic: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure
Replies: 13
Views: 2259

Re: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure

Dear Jason, I have defined all matrices in the BModes_JJ input file to define the flexible substructure: Platform-reference-point-referred hydrodynamic 6X6 matrix (hydro_M): 6.2094E+06 -2.5740E+03 -2.7409E+02 -6.3934E+04 -1.1295E+08 -1.1394E+04 -2.4698E+03 6.2098E+06 6.7063E+01 1.1296E+08 7.0010E+04...
by Daniel.Walia
Thu Feb 07, 2019 6:55 am
Forum: Computer-Aided Engineering Software Tools
Topic: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure
Replies: 13
Views: 2259

Re: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure

Dear Jason, thank you very much for your explanation. I think this made everything pretty much clear to me. I ran into an issue with an Segmentation Fault error, when trying to run the model by using MAP++ in order to derive the mooring stiffness matrix. But this is a different issue. That is why I ...
by Daniel.Walia
Mon Feb 04, 2019 7:55 am
Forum: Computer-Aided Engineering Software Tools
Topic: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure
Replies: 13
Views: 2259

Re: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure

Dear Jason, thank you for your explanations. They made most of the topics clear to me. However, the following question remains: 2) For hydro_M, you could use the hydrodynamic added mass from WAMIT (or in your case, AQWA) at a given frequency e.g. the zero-frequency limit. [ I have tried to find out ...
by Daniel.Walia
Wed Jan 30, 2019 9:25 am
Forum: Computer-Aided Engineering Software Tools
Topic: Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure
Replies: 13
Views: 2259

Preprocessing Hydrodynamic Properties for BModesJJ / OpenFAST of a floating substructure

Dear Jason, (or maybe others who are experienced in this topic), i am currently setting up an OpenFAST (v2.0) (i´ll call it OFAST below) model of the NREL 5.0MW reference turbine on a TLP floater. We did series of tank tests (wave and wind) using a physical 1:50 scale model of our TLP and a respecti...
by Daniel.Walia
Fri Dec 07, 2018 12:22 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question regarding HydroDyn Strip Theory Implementation
Replies: 13
Views: 2417

Re: Question regarding HydroDyn Strip Theory Implementation

Dear Jason, thank you very much for these informations. For a more sophisticated model we will definetely implement the pressure distribution from a potential-flow solution. At this point just wanted to make sure that I understood how HydroDyn deals with the added mass and the corresponding Ca, for ...
by Daniel.Walia
Thu Dec 06, 2018 8:09 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question regarding HydroDyn Strip Theory Implementation
Replies: 13
Views: 2417

Re: Question regarding HydroDyn Strip Theory Implementation

Dear Jason, thank you for the explanation. Just to make sure that I understood this correctly: For a circular disc which is subjected to flow an added mass coefficient of Ca = 2/Pi is suitable. This can be applied to different joints of the structure. The only important factor is the shape of the su...
by Daniel.Walia
Wed Dec 05, 2018 9:27 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question regarding HydroDyn Strip Theory Implementation
Replies: 13
Views: 2417

Re: Question regarding HydroDyn Strip Theory Implementation

Dear Jason, I am sorry for necro-bumping this thread. But after going again a little bit deeper into HydroDyn I learned that there are still some uncertainties on my side which I´d like to clearify. Regarding the axial coefficients: - Axial coefficients have to be defined for the member ends as show...
by Daniel.Walia
Mon Oct 29, 2018 7:49 am
Forum: Computer-Aided Engineering Software Tools
Topic: Invalid numerical input for file
Replies: 9
Views: 2671

Re: Invalid numerical input for file

Dear Jason, I have found a number of errors (specific lines missing) in AD input file, as there have even more lines been added within the latest AD update. E.g the lines ====== Dynamic Blade-Element/Momentum Theory Options ============================================== [used only when WakeMod=2] 2 ...
by Daniel.Walia
Fri Oct 26, 2018 7:21 am
Forum: Computer-Aided Engineering Software Tools
Topic: Invalid numerical input for file
Replies: 9
Views: 2671

Re: Invalid numerical input for file

Dear Jason, thank you for your reply. I have tried different configurations with the Aerodyn-files I have gotten from Paul (who is out of office for a while) and applied the changes he suggested me to incorporate to make the Aerodyn-files working with OpenFAST. It seems that I have overlooked someth...
by Daniel.Walia
Tue Oct 23, 2018 10:08 am
Forum: Computer-Aided Engineering Software Tools
Topic: Invalid numerical input for file
Replies: 9
Views: 2671

Invalid numerical input for file

Hey there, after a while I am getting back to work with FAST, finally. Thus, I have compiled OpenFAST on my ArchLinux system and try to run some old simulations where the input files have been written to be used with FAST v8.16. However, as recommended in[ https://wind.nrel.gov/nwtc/docs/README_Open...
by Daniel.Walia
Mon Jan 02, 2017 8:10 am
Forum: Computer-Aided Engineering Software Tools
Topic: Question regarding HydroDyn Strip Theory Implementation
Replies: 13
Views: 2417

Re: Question regarding HydroDyn Strip Theory Implementation

Dear Jason,

thank you very much for your response.

Best regards,
Daniel

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