Verification of aero-elastic offshore wind turbine design codes under IEA Wind Task XXIII

Wind Energy ◽  
2013 ◽  
Vol 17 (4) ◽  
pp. 519-547 ◽  
Author(s):  
Fabian Vorpahl ◽  
Michael Strobel ◽  
Jason M. Jonkman ◽  
Torben J. Larsen ◽  
Patrik Passon ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Design Codes ◽  
Turbine Design

scholarly journals Efficient preliminary floating offshore wind turbine design and testing methodologies and application to a concrete spar design

2015 ◽  
Vol 373 (2035) ◽  
pp. 20140350 ◽  
Author(s):  
Denis Matha ◽  
Frank Sandner ◽  
Climent Molins ◽  
Alexis Campos ◽  
Po Wen Cheng
Keyword(s):  
Wind Turbine ◽  
Design Process ◽  
Experimental Tests ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Floating Offshore Wind Turbine ◽  
Testing Methodology ◽  
Cost Of Energy ◽  
Turbine Design ◽  
Design And Testing

The current key challenge in the floating offshore wind turbine industry and research is on designing economic floating systems that can compete with fixed-bottom offshore turbines in terms of levelized cost of energy. The preliminary platform design, as well as early experimental design assessments, are critical elements in the overall design process. In this contribution, a brief review of current floating offshore wind turbine platform pre-design and scaled testing methodologies is provided, with a focus on their ability to accommodate the coupled dynamic behaviour of floating offshore wind systems. The exemplary design and testing methodology for a monolithic concrete spar platform as performed within the European KIC AFOSP project is presented. Results from the experimental tests compared to numerical simulations are presented and analysed and show very good agreement for relevant basic dynamic platform properties. Extreme and fatigue loads and cost analysis of the AFOSP system confirm the viability of the presented design process. In summary, the exemplary application of the reduced design and testing methodology for AFOSP confirms that it represents a viable procedure during pre-design of floating offshore wind turbine platforms.

scholarly journals Modeling the TetraSpar Floating Offshore Wind Turbine Foundation as a Flexible Structure in OrcaFlex and OpenFAST

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7866
Author(s):  
Jonas Bjerg Thomsen ◽  
Roger Bergua ◽  
Jason Jonkman ◽  
Amy Robertson ◽  
Nicole Mendoza ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Entire Body ◽  
Floating Offshore Wind Turbine ◽  
Modeling Approaches ◽  
Rigid Body Model ◽  
Six Degree Of Freedom ◽  
Turbine Design ◽  
Floating Platforms

Floating offshore wind turbine technology has seen an increasing and continuous development in recent years. When designing the floating platforms, both experimental and numerical tools are applied, with the latter often using time-domain solvers based on hydro-load estimation from a Morison approach or a boundary element method. Commercial software packages such as OrcaFlex, or open-source software such as OpenFAST, are often used where the floater is modeled as a rigid six degree-of-freedom body with loads applied at the center of gravity. However, for final structural design, it is necessary to have information on the distribution of loads over the entire body and to know local internal loads in each component. This paper uses the TetraSpar floating offshore wind turbine design as a case study to examine new modeling approaches in OrcaFlex and OpenFAST that provide this information. The study proves the possibility of applying the approach and the extraction of internal loads, while also presenting an initial code-to-code verification between OrcaFlex and OpenFAST. As can be expected, comparing the flexible model to a rigid-body model proves how motion and loads are affected by the flexibility of the structure. OrcaFlex and OpenFAST generally agree, but there are some differences in results due to different modeling approaches. Since no experimental data are available in the study, this paper only forms a baseline for future studies but still proves and describes the possibilities of the approach and codes.

scholarly journals Multibody modeling for concept-level floating offshore wind turbine design

2020 ◽  
Vol 49 (2) ◽  
pp. 203-236 ◽  
Author(s):  
Frank Lemmer ◽  
Wei Yu ◽  
Birger Luhmann ◽  
David Schlipf ◽  
Po Wen Cheng
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Multibody Modeling ◽  
Floating Offshore Wind Turbine ◽  
Turbine Design

Offshore wind turbine design

2000 ◽  
Author(s):  
W. Watson ◽  
Mark Dublin
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Turbine Design

The Influence of the Mooring System on the Motions and Stability of a Semi-Submersible Floating Wind Turbine

2015 ◽  
Author(s):  
Fons Huijs
Keyword(s):  
Wind Turbine ◽  
Low Frequency ◽  
Considerable Effect ◽  
Offshore Wind ◽  
Mooring Line ◽  
Offshore Wind Turbine ◽  
Mooring System ◽  
Mooring Lines ◽  
System A ◽  
Turbine Design

One of the main aspects of a floating offshore wind turbine design is its mooring system, which can strongly influence the floater stability and motions. This is illustrated by considering two catenary mooring systems for the same semi-submersible. The main difference between the two systems is the position of the connection points of the mooring lines on the floater, the so-called fairleads. The philosophy is that the design can be improved by shifting the fairleads to the highest feasible level. For both mooring systems, the floater motions and stability are assessed. Stability curves are derived, taking both the effect of hydrostatics and the mooring system into account. Floater motions are analyzed using both uncoupled frequency domain calculations and coupled aero-hydro-servo-elastic time domain simulations. The mooring system is found to have a considerable effect on the floating stability. The effect on the motions is less profound for the considered mooring systems and limited to the low frequency range. Mooring line tensions are however significantly affected by the fairlead position. It is concluded that, with a well-designed mooring system, a smaller and thus less expensive floater can be used while still meeting the requirements in terms of stability and maximum motions. In addition, the mooring lines may be lighter as well.

Finding functional redundancies in offshore wind turbine design

Wind Energy ◽  
2011 ◽  
Vol 15 (4) ◽  
pp. 609-626 ◽  
Author(s):  
E. Echavarría ◽  
G. J. W. Bussel ◽  
T. Tomiyama
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Turbine Design

scholarly journals Gusts and shear within hurricane eyewalls can exceed offshore wind turbine design standards

2017 ◽  
Vol 44 (12) ◽  
pp. 6413-6420 ◽  
Author(s):  
Rochelle P. Worsnop ◽  
Julie K. Lundquist ◽  
George H. Bryan ◽  
Rick Damiani ◽  
Walt Musial
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Design Standards ◽  
Turbine Design
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