Definition of the Semisubmersible Floating System for Phase II of OC4

Robertson, Amy; Jonkman, Jason; Masciola, Marco; Song, Huimin; Goupee, Andrew J.; Coulling, Alexander J.; Luan, Chenyu

doi:10.2172/1155123

Cited by 370 publications

(420 citation statements)

References 8 publications

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“…Generally, for a vertical cylinder with a large diameter, flow separation occurs only in: (i) the upper section of the cylinder, because of the larger fluid particle velocities closer to the surface; or (ii) in extreme sea states because of the associated longer wave period, T. As demonstrated in the OC4 study [17], the KC number is less than two for the large components of the OC4 DeepCwind semi-submersible platform for almost all sea states except for extreme wave conditions (such as the Normal Sea States 6-8 defined in Table 9). For these same sea states, we find that potential flow theory is more widely applicable for the 1.5-scaled SNL platform model than was the case for the OC4 DeepCwind platform (refer to Figure 7a,b).…”

Section: Platform and Mooring System Developmentmentioning

confidence: 99%

“…At the initial stage of an innovative design, such as this one involving a very large rotor, it is common to take advantage of completed studies of a similar nature. In this study, the OC4-DeepCwind semi-submersible floating platform and offshore wind turbine [17] are chosen as the baseline model to which changes are made. Froude scaling is applied to this baseline configuration of the OC4-DeepCwind model to develop the SNL 13.2-MW turbine's semi-submersible platform model.…”

Section: Snl 132-mw Baseline Turbine Propertiesmentioning

confidence: 99%

“…The multiplication factor in the last column of the table indicates the scale factor to be applied in going from the baseline OC4 model to the proposed model based on the Froude scaling law, to be discussed later. Additional details related to the baseline OC4-DeepCwind semi-submersible platform model can be found elsewhere [17]. We should note here that since the SNL 13.2 MW turbine and semi-submersible platform system are to be deployed at a water depth of 200 m, which is the same as for the OC4 DeepCwind study, Froude scaling cannot be applied directly to the dimensions of the mooring system.…”

Section: Snl 132-mw Baseline Turbine Propertiesmentioning

confidence: 99%

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Integrated System Design for a Large Wind Turbine Supported on a Moored Semi-Submersible Platform

Liu

Thomas

Manuel

et al. 2018

JMSE

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Abstract:Over the past few decades, wind energy has emerged as an alternative to conventional power generation that is economical, environmentally friendly and, importantly, renewable. Specifically, offshore wind energy is being considered by a number of countries to harness the stronger and more consistent wind resource compared to that over land. To meet the projected "20% energy from wind by 2030" scenario that was announced in 2006, 54 GW of added wind energy capacity need to come from offshore according to a National Renewable Energy Laboratory (NREL) study. In this study, we discuss the development of a semi-submersible floating offshore platform with a catenary mooring system to support a very large 13.2-MW wind turbine with 100-m blades. An iterative design process is applied to baseline models with Froude scaling in order to achieve preliminary static stability. Structural dynamic analyses are performed to investigate the performance of the new model using a finite element method approach for the tower and a boundary integral equation (panel) method for the platform. The steady-state response of the system under uniform wind and regular waves is first studied to evaluate the performance of the integrated system. Response amplitude operators (RAOs) are computed in the time domain using white-noise wave excitation; this serves to highlight nonlinear, as well as dynamic characteristics of the system. Finally, selected design load cases (DLCs) and the stochastic dynamic response of the system are studied to assess the global performance for sea states defined by wind fields with turbulence and long-crested irregular waves.

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Section: Platform and Mooring System Developmentmentioning

confidence: 99%

Section: Snl 132-mw Baseline Turbine Propertiesmentioning

confidence: 99%

Section: Snl 132-mw Baseline Turbine Propertiesmentioning

confidence: 99%

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Integrated System Design for a Large Wind Turbine Supported on a Moored Semi-Submersible Platform

Liu

Thomas

Manuel

et al. 2018

JMSE

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“…A comprehensive dynamic response for six floating offshore wind turbines (FOWTs), spanning all the stability classes, was presented by Robertson and Jonkman (2011). Lefebvre and Collu (2012) used seven preliminary platform concepts and compared them through a technoeconomic analysis to find the best design within the set of seven [5].…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Flow over Cascade Arrangement of Bluff Bodies with Different Geometries

Kumar¹,

Sachendra²,

Singhal³

2017

Preprint

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---Most of the structures in flowing water are a challenge to their stability and sustainable with different flow conditions. Recent, renewable energy research and development covers ocean and river energy platform in which flow of water drag considered in various conversion devices towards the offshore and onshore establishment. Various energy platforms have been suggested for offshore development. However, the stability of these platforms in water is a serious concern. To study the water interaction over circular and square cross-section cascade system under the water has been carried out. Water flow around the pillars or column of the energy platform are analyzed through simulation software. Very low velocity 0.5 m/s has been considered to analyze the system. Total fifteen numbers of cascade pillars having circular and square cross-section area were considered. K-ε turbulence model is adopted to calculate the flow interaction to the column. A velocity, pressure, and energy fields are found around the column..

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“…Column(footing)의 직경을 선정하였다 (Robertson, et al, 2012). (Jonkman, et al, 2005 (Robertson, et al, 2012).…”

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A Study on the Optimal Shape Design of a Floating Offshore Wind Turbine

Park¹,

Shin

2015

Journal of the Society of Naval Architects of Korea

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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Usually, in case of wind turbines on land, there are a lot of constraints for installation such as the insufficient installation space and noise pollution. On March 11, 2011, a nuclear leakage accident occurred due to the tsunami caused by the earthquake in Japan and then there have been a rapidly growing interest in floating offshore wind turbines. In this study, an optimization of the substructure of a semi-submersible type floating offshore wind turbine was made. Design variables were set and design alternatives were fixed.

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Definition of the Semisubmersible Floating System for Phase II of OC4

Cited by 370 publications

References 8 publications

Integrated System Design for a Large Wind Turbine Supported on a Moored Semi-Submersible Platform

Integrated System Design for a Large Wind Turbine Supported on a Moored Semi-Submersible Platform

Computational Study of Flow over Cascade Arrangement of Bluff Bodies with Different Geometries

A Study on the Optimal Shape Design of a Floating Offshore Wind Turbine

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