Validation of a three-dimensional viscous-inviscid interactive solver for wind turbine rotors

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MIRAS is a newly developed computational model that predicts the aerodynamic behavior of wind turbine blades and wakes subject to unsteady motions and viscous effects. The model is based on a three-dimensional panel method using a surface distribution of quadrilateral singularities with a Neumann no penetration condition. Viscous effects inside the boundary layer are taken into account through the coupling with the quasi-3D integral boundary layer solver Q3UIC. A free-wake model is employed to simulate the vorticity released by the blades in the wake. In this paper the new code is validated against measurements and/or CFD simulations for five wind turbine rotors, including three experimental model rotors [20-22], the 2.5 MW NM80 machine [23] and the NREL 5 MW virtual rotor [24]. Such a broad set of operational conditions and rotor sizes constitutes a very challenging validation matrix, with Reynolds numbers ranging from 5.0·104 to 1.2·107.

Original languageEnglish
JournalRenewable Energy
Pages (from-to)78-92
Publication statusPublished - 2014

Bibliographical note

Special issue on aerodynamics of offshore wind energy systems and wakes


  • Wind turbine
  • Panel method
  • Free wake
  • Viscous-inviscid interaction
  • Integral boundary layer equations


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