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Title: Effect of Second-Order Hydrodynamics on Floating Offshore Wind Turbines: Preprint

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 behavior. 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, andmore » compared to aerodynamic effects.« less

Authors:
; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy Wind Power Program
OSTI Identifier:
1089059
Report Number(s):
NREL/CP-5000-58718
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at DeepWind?2013 - 10th Deep Sea Offshore Wind R&D Conference, 24-25 January 2013, Trondheim, Norway
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; OFFSHORE FLOATING WIND TURBINE; SECOND-ORDER HYDRODYNAMICS; WAVE LOADS; SPAR BUOY; TENSION-LEG PLATFORM; Wind Energy

Citation Formats

Roald, L., Jonkman, J., Robertson, A, and Chokani, N. Effect of Second-Order Hydrodynamics on Floating Offshore Wind Turbines: Preprint. United States: N. p., 2013. Web.
Roald, L., Jonkman, J., Robertson, A, & Chokani, N. Effect of Second-Order Hydrodynamics on Floating Offshore Wind Turbines: Preprint. United States.
Roald, L., Jonkman, J., Robertson, A, and Chokani, N. 2013. "Effect of Second-Order Hydrodynamics on Floating Offshore Wind Turbines: Preprint". United States. https://www.osti.gov/servlets/purl/1089059.
@article{osti_1089059,
title = {Effect of Second-Order Hydrodynamics on Floating Offshore Wind Turbines: Preprint},
author = {Roald, L. and Jonkman, J. and Robertson, A and Chokani, N.},
abstractNote = {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 behavior. 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.},
doi = {},
url = {https://www.osti.gov/biblio/1089059}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 2013},
month = {Mon Jul 01 00:00:00 EDT 2013}
}

Conference:
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