Implementation of a Generalized Actuator Line Model for Wind Turbine Parameterization in the Weather Research and Forecasting Model: Article No. 063308

Julie Lundquist, Nikola Marjanovic, Jeffrey Mirocha, Branko Kosovic, Fotini Chow

Research output: Contribution to journalArticlepeer-review

18 Scopus Citations

Abstract

A generalized actuator line (GAL) wind turbine parameterization is implemented within the Weather Research and Forecasting model to enable high-fidelity large-eddy simulations of wind turbine interactions with boundary layer flows under realistic atmospheric forcing conditions. Numerical simulations using the GAL parameterization are evaluated against both an already implemented generalized actuator disk (GAD) wind turbine parameterization and two field campaigns that measured the inflow and near-wake regions of a single turbine. The representation of wake wind speed, variance, and vorticity distributions is examined by comparing fine-resolution GAL and GAD simulations and GAD simulations at both fine and coarse-resolutions. The higher-resolution simulations show slightly larger and more persistent velocity deficits in the wake and substantially increased variance and vorticity when compared to the coarse-resolution GAD. The GAL generates distinct tip and root vortices that maintain coherence as helical tubes for approximately one rotor diameter downstream. Coarse-resolution simulations using the GAD produce similar aggregated wake characteristics to both fine-scale GAD and GAL simulations at a fraction of the computational cost. The GAL parameterization provides the capability to resolve near wake physics, including vorticity shedding and wake expansion.
Original languageAmerican English
Number of pages28
JournalJournal of Renewable and Sustainable Energy
Volume9
Issue number6
DOIs
StatePublished - 2017

NREL Publication Number

  • NREL/JA-5000-71250

Keywords

  • aerodynamics
  • eddies
  • turbulent flows
  • vortex dynamics

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