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Title: Effect of Second-Order and Fully Nonlinear Wave Kinematics on a Tension-Leg-Platform Wind Turbine in Extreme Wave Conditions

Abstract

In this study, we assess the impact of different wave kinematics models on the dynamic response of a tension-leg-platform wind turbine. Aero-hydro-elastic simulations of the floating wind turbine are carried out employing linear, second-order, and fully nonlinear kinematics using the Morison equation for the hydrodynamic forcing. The wave kinematics are computed from either theoretical or measured signals of free-surface elevation. The numerical results from each model are compared to results from wave basin tests on a scaled prototype. The comparison shows that sub and superharmonic responses can be introduced by second-order and fully nonlinear wave kinematics. The response at the wave frequency range is better reproduced when kinematics are generated from the measured surface elevation. In the future, the numerical response may be further improved by replacing the global, constant damping coefficients in the model by a more detailed, customizable definition of the user-defined numerical damping.

Authors:
 [1];  [1];  [2];  [2];  [2]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. Technical University of Denmark
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1409009
Report Number(s):
NREL/CP-5000-70504
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, 25-30 June 2017, Trondheim, Norway
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; numerical modelling; validation; aero-hydro-elastic code; floating wind turbine; nonlinear wave kinematics

Citation Formats

Robertson, Amy N, Jonkman, Jason, Pegalajar-Jurado, Antonio, Borg, Michael, and Bredmose, Henrik. Effect of Second-Order and Fully Nonlinear Wave Kinematics on a Tension-Leg-Platform Wind Turbine in Extreme Wave Conditions. United States: N. p., 2017. Web. doi:10.1115/OMAE2017-61798.
Robertson, Amy N, Jonkman, Jason, Pegalajar-Jurado, Antonio, Borg, Michael, & Bredmose, Henrik. Effect of Second-Order and Fully Nonlinear Wave Kinematics on a Tension-Leg-Platform Wind Turbine in Extreme Wave Conditions. United States. doi:10.1115/OMAE2017-61798.
Robertson, Amy N, Jonkman, Jason, Pegalajar-Jurado, Antonio, Borg, Michael, and Bredmose, Henrik. Sat . "Effect of Second-Order and Fully Nonlinear Wave Kinematics on a Tension-Leg-Platform Wind Turbine in Extreme Wave Conditions". United States. doi:10.1115/OMAE2017-61798.
@article{osti_1409009,
title = {Effect of Second-Order and Fully Nonlinear Wave Kinematics on a Tension-Leg-Platform Wind Turbine in Extreme Wave Conditions},
author = {Robertson, Amy N and Jonkman, Jason and Pegalajar-Jurado, Antonio and Borg, Michael and Bredmose, Henrik},
abstractNote = {In this study, we assess the impact of different wave kinematics models on the dynamic response of a tension-leg-platform wind turbine. Aero-hydro-elastic simulations of the floating wind turbine are carried out employing linear, second-order, and fully nonlinear kinematics using the Morison equation for the hydrodynamic forcing. The wave kinematics are computed from either theoretical or measured signals of free-surface elevation. The numerical results from each model are compared to results from wave basin tests on a scaled prototype. The comparison shows that sub and superharmonic responses can be introduced by second-order and fully nonlinear wave kinematics. The response at the wave frequency range is better reproduced when kinematics are generated from the measured surface elevation. In the future, the numerical response may be further improved by replacing the global, constant damping coefficients in the model by a more detailed, customizable definition of the user-defined numerical damping.},
doi = {10.1115/OMAE2017-61798},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jun 03 00:00:00 EDT 2017},
month = {Sat Jun 03 00:00:00 EDT 2017}
}

Conference:
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