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

Matthew Churchfield, Luis Martinez, H. Johlas, D. Schmidt, M. Lackner

Research output: Contribution to journalArticlepeer-review

15 Scopus Citations

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 (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. However, these observed wake differences between fixed and floating platforms are small, especially for higher wind speeds and lower wave heights.

Original languageAmerican English
Article numberArticle No. 012018
Number of pages10
JournalJournal of Physics: Conference Series
Volume1256
Issue number1
DOIs
StatePublished - 22 Jul 2019
EventWake Conference 2019 - Visby, Sweden
Duration: 22 May 201924 May 2019

Bibliographical note

See NREL/CP-5000-73218 for preprint

NREL Publication Number

  • NREL/JA-5000-74586

Keywords

  • floating
  • large eddy simulation
  • offshore wind
  • wind energy
  • wind turbine

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