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Large eddy simulations of floating offshore wind turbine wakes with coupled platform motion

Journal Article · · Journal of Physics. Conference Series
 [1];  [2];  [1];  [1];  [2]
  1. Univ. of Massachusetts, Amherst, MA (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
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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 (SOWFA) 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. Furthermore, these observed wake differences between fixed and floating platforms are small, especially for higher wind speeds and lower wave heights.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1557553
Alternate ID(s):
OSTI ID: 1545980
Report Number(s):
NREL/JA--5000-74586
Journal Information:
Journal of Physics. Conference Series, Journal Name: Journal of Physics. Conference Series Vol. 1256; ISSN 1742-6588
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

17 WIND ENERGY
floating
large eddy simulation
offshore wind
wind energy
wind turbine