Development and Verification of an Improved Wake-Added Turbulence Model in FAST.Farm: Article No. 092036

E. Branlard, J. Jonkman, A. Platt, R. Thedin, L. Martinez-Tossas, M. Kretschmer

Research output: Contribution to journalArticlepeer-review

Abstract

We introduce a generalized wake-added turbulence (WAT) model in the multiphysics, multiturbine simulation tool FAST.Farm. The WAT model introduces additional small-scale turbulence that represents the breakdown of vortical structures and shear layers in the wake. The article describes the development, implementation, calibration, and verification of the model. The novelties of the model include support for wake asymmetry, buildup of WAT across the wind farm, and secondary effects of wake-induced turbulence (e.g., wake meandering) driven by smaller-scale turbulence structures that arise from wake breakdown. Large-eddy simulations were run to support the calibration of the WAT parameters and verification of the model. Previous studies hypothesized that the lack of WAT modeling was the source of underprediction of fatigue loads, in particular for cases at low turbulence intensities and/or stable atmospheric boundary layers. This study confirms that the newly implemented WAT model enhances the loads predictions in these cases.
Original languageAmerican English
Number of pages13
JournalJournal of Physics: Conference Series
Volume2767
Issue number9
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5000-88164

Keywords

  • dynamic wake meandering
  • FAST.Farm
  • simulation technologies
  • wake-added turbulence
  • wakes
  • wind farm

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