The effect of second-order hydrodynamics on floating offshore wind turbines
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Author / Producer
Date
2013
Publication Type
Conference Paper
ETH Bibliography
yes
Citations
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Abstract
Offshore winds are generally stronger and more consistent than winds on land, making the offshore environment attractive for wind energy development. A large part of the offshore wind resource is however located in deep water, where floating turbines are the only economical way of harvesting the energy. The design of offshore floating wind turbines relies on the use of modeling tools that can simulate the entire coupled system behaviour. At present, most of these tools include only first-order hydrodynamic theory. However, observations of supposed second-order hydrodynamic responses in wave-tank tests performed by the DeepCwind consortium suggest that second-order effects might be critical. In this paper, the methodology used by the oil and gas industry has been modified to apply to the analysis of floating wind turbines, and is used to assess the effect of second-order hydrodynamics on floating offshore wind turbines. The method relies on combined use of the frequency-domain tool WAMIT and the time- domain tool FAST. The proposed assessment method has been applied to two different floating wind concepts, a spar and a tension-leg-platform (TLP), both supporting the NREL 5-MW baseline wind turbine. Results showing the hydrodynamic forces and motion response for these systems are presented and analysed, and compared to aerodynamic effects.
Permanent link
Publication status
published
External links
Book title
DeepWind'2013 – Selected papers from 10th Deep Sea Offshore Wind R&D Conference
Journal / series
Volume
35
Pages / Article No.
253 - 264
Publisher
Elsevier
Event
10th Deep Sea Offshore Wind R and D Conference (DeepWind 2013)
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Offshore floating wind turbine; Second-order hydrodynamics; Wave loads; Spar buoy; Tension-leg platform
Organisational unit
03548 - Abhari, Reza S. / Abhari, Reza S.
03559 - Andersson, Göran (emeritus)