## ITI 5MW Barge

Discuss theory and modeling of wind-turbine structures.

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Zahid.Ullah
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Joined: Sun Jul 24, 2016 6:59 pm
Organization: HYU
Location: South Korea

### Re: ITI 5MW Barge

Dear Dr. Jason Jonkman

I am trying to analyze the ITI 5MW Barge using FAST V8. I have few questions regarding the geometry of the platform and tower used. I would highyl appreciate your help.
1. In some reports the dimensions of the Moon-Pool are given as 10 * 10 * 10 m while in one report given as 10*10*3.99 m. I believe the later ones are correct dimensions?

2. In Table 3-8 of your PhD dissertation the tower mass is given as 347,460 m, and tower height above ground is given as 87.60 m and its center of mass given as 38.234 m with respect to ground or MSL. In the ElastoDyn input file for ITI-Barge the distance from the MSL to the tower base is, TowerBsHt = 0. This made me confuse about the tower height and its center of mass. As the free-board of the platform is 6 m then the TowerBsHt from MSL should be 6 m. Thus the total height of the tower becomes 87.60 - 6 m. I would highly appreciate your help regarding the correct values of the tower height, tower base, and its center of mass from MSL.

Also i will be thankful if you can send me a copy of Vijfuizen's MS thesis, i will email you.

Thank you

Jason.Jonkman
Posts: 4952
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

### Re: ITI 5MW Barge

Dear Zahid,

Here are my answers to your questions regarding the ITI Energy barge:

1. The actual dimensions of the moon pool are 10 x 10 x 10 m. The WAMIT model only needs to consider the wetted portion of the surface of the barge with moon pool in the undisplaced position i.e. the draft of 4 m. Because we did not attempt to model the energy extraction device in the moon pool, we simply covered the top of the moon pool in the WAMIT model with a flat plat located 0.01-m below the MSL, resulting in the WAMIT model having a moon pool of dimensions 10 x 10 x 3.99 m. See my PhD thesis-turned NREL report for more information: http://www.nrel.gov/docs/fy10osti/45891.pdf.

2. The moon pool is located in the center of the barge and the details of how the tower--also located in the center of the barge--was connected to the barge were never flushed out in the design. So, we simply modeled the tower base at the MSL.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Matt.Chen
Posts: 2
Joined: Thu Jul 25, 2019 1:47 am
Organization: National Sun Yat-Sen University
Location: Kaohsiung, Taiwan

### Re: ITI 5MW Barge

Dear Dr. Jason Jonkman

I am trying to analyze the ITI 5MW Barge by using openfast. I would like to know about the design condition of the platform.

I will be thankful if you can send me a copy of Vijfuizen's MS thesis.

Thank you

Jason.Jonkman
Posts: 4952
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

### Re: ITI 5MW Barge

Dear Matt,

I've sent Vijfuizen's MS thesis to you via e-mail.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

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