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Title: Large Eddy Simulations of Floating Offshore Wind Turbine Wakes with Coupled Platform Motion: Preprint

Abstract

The growing prospect for large farms of floating offshore wind turbines requires a better understanding of wake effects for floating turbines, particularly the differences when compared to fixed-bottom turbine wakes. The increased range of motion of floating platforms can influence wake characteristics, affecting downstream turbines. In this work, large eddy simulations with an actuator line model are used to study downstream wake characteristics of the NREL 5-MW reference turbine mounted on the OC3-UMaine spar platform for several different metocean conditions. The simulations are carried out in the Simulator fOr Wind Farm Applications coupled with OpenFAST for the platform and turbine motion. The downstream wake characteristics of the floating platform are compared to equivalent fixed-bottom cases for different wind speeds, wave heights, wind-wave alignments, and turbine yaw angles. Overall, the differences in wake shape between floating and fixed platforms are associated with mean platform displacements, while differences in turbulence are associated with time-varying platform motion. However, these observed wake differences between fixed and floating platforms are small, especially for higher wind speeds and lower wave heights.

Authors:
 [1]; ORCiD logo [2];  [1];  [1]; ORCiD logo [2]
  1. University of Masschusetts
  2. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
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:
1545980
Report Number(s):
NREL/CP-5000-73218
Journal ID: ISSN 1742--6588
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Journal Volume: 1256; Conference: Presented at Wakes Conference 2019, 22-24 May 2019, Visby, Sweden
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; wind energy; offshore wind; large eddy simulation; floating; wind turbine

Citation Formats

Johlas, H. M, Martinez, Luis, Schmidt, D. P, Lackner, M. A, and Churchfield, Matthew J. Large Eddy Simulations of Floating Offshore Wind Turbine Wakes with Coupled Platform Motion: Preprint. United States: N. p., 2019. Web. doi:10.1088/1742-6596/1256/1/012018.
Johlas, H. M, Martinez, Luis, Schmidt, D. P, Lackner, M. A, & Churchfield, Matthew J. Large Eddy Simulations of Floating Offshore Wind Turbine Wakes with Coupled Platform Motion: Preprint. United States. doi:10.1088/1742-6596/1256/1/012018.
Johlas, H. M, Martinez, Luis, Schmidt, D. P, Lackner, M. A, and Churchfield, Matthew J. Thu . "Large Eddy Simulations of Floating Offshore Wind Turbine Wakes with Coupled Platform Motion: Preprint". United States. doi:10.1088/1742-6596/1256/1/012018. https://www.osti.gov/servlets/purl/1545980.
@article{osti_1545980,
title = {Large Eddy Simulations of Floating Offshore Wind Turbine Wakes with Coupled Platform Motion: Preprint},
author = {Johlas, H. M and Martinez, Luis and Schmidt, D. P and Lackner, M. A and Churchfield, Matthew J},
abstractNote = {The growing prospect for large farms of floating offshore wind turbines requires a better understanding of wake effects for floating turbines, particularly the differences when compared to fixed-bottom turbine wakes. The increased range of motion of floating platforms can influence wake characteristics, affecting downstream turbines. In this work, large eddy simulations with an actuator line model are used to study downstream wake characteristics of the NREL 5-MW reference turbine mounted on the OC3-UMaine spar platform for several different metocean conditions. The simulations are carried out in the Simulator fOr Wind Farm Applications coupled with OpenFAST for the platform and turbine motion. The downstream wake characteristics of the floating platform are compared to equivalent fixed-bottom cases for different wind speeds, wave heights, wind-wave alignments, and turbine yaw angles. Overall, the differences in wake shape between floating and fixed platforms are associated with mean platform displacements, while differences in turbulence are associated with time-varying platform motion. However, these observed wake differences between fixed and floating platforms are small, especially for higher wind speeds and lower wave heights.},
doi = {10.1088/1742-6596/1256/1/012018},
journal = {},
issn = {1742--6588},
number = ,
volume = 1256,
place = {United States},
year = {2019},
month = {7}
}

Conference:
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