Aeroacoustics Noise Model of OpenFAST

Pietro Bortolotti, Emmanuel Branlard, Andy Platt, Patrick Moriarty, Carlo Sucameli, Carlo Bottasso

Research output: NRELTechnical Report


The report describes theory and application of a newly released module of OpenFAST to simulate the aeroacoustic noise generated by the rotor of an arbitrary wind turbine. OpenFAST is a fully open-source publicly available wind turbine analysis tool actively developed at the National Renewable Energy Laboratory. The aeroacoustic module, which is also fully open-source and publicly available, is based on work performed over the past three decades. Frequency-based models for turbulent inflow, turbulent boundary layer – trailing edge, laminar boundary layer – vortex shedding, tip vortex, and trailing edge bluntness – vortex shedding noise mechanisms are included. A simple directivity model is also included. The appendices of this report describe in detail the inputs to the module and how to find them in the input files of OpenFAST. The noise models are exercised simulating the aeroacoustic noise emissions of the IEA Wind Task 37 land-based reference wind turbine. A code-to-code comparison between the implementation presented here and the implementation available at the Wind Energy Institute of the Technical University of Munich, Germany, is also presented.
Original languageAmerican English
Number of pages42
StatePublished - 2020

NREL Publication Number

  • NREL/TP-5000-75731


  • aeroacoustics
  • Amiet
  • BPM
  • OpenFAST
  • wind turbine noise
  • wind turbine simulation


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