Open AccessVortex‐induced vibrations of a DU96‐W‐180 airfoil at 90° angle of attack
Author(s) -
Skrzypiński Witold,
Gaunaa Mac,
Sørensen Niels,
Zahle Frederik,
Heinz Joachim
Publication year - 2014
Publication title -
wind energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 92
eISSN - 1099-1824
pISSN - 1095-4244
DOI - 10.1002/we.1647
Subject(s) - airfoil , vortex shedding , vortex , physics , computational fluid dynamics , mechanics , computation , reynolds number , detached eddy simulation , aerodynamics , angle of attack , classical mechanics , lift (data mining) , chord (peer to peer) , vibration , reynolds averaged navier–stokes equations , acoustics , mathematics , computer science , turbulence , algorithm , distributed computing , data mining
This work presents an analysis of vortex‐induced vibrations of a DU96‐W‐180 airfoil in deep stall at a 90° angle of attack, based on 2D and 3D Reynolds Averaged Navier Stokes and 3D Detached Eddy Simulation unsteady Computational Fluid Dynamics computations with non‐moving, prescribed motion and elastically mounted airfoil suspensions. Stationary vortex‐shedding frequencies computed in 2D and 3D Computational Fluid Dynamics differed. In the prescribed motion computations, the airfoil oscillated in the direction of the chord line. Negative aerodynamic damping, found in both 2D and 3D Computational Fluid Dynamics computations with moving airfoil, showed in the vicinity of the stationary vortex‐shedding frequency computed by 2D Computational Fluid Dynamics. A shorter time series was sufficient to verify the sign of the aerodynamic damping in the case of the elastic computations than the prescribed motion. Even though the 2D computations seemed to be capable of indicating the presence of vortex‐induced vibrations, the 3D computations seemed to reflect the involved physics more accurately. Copyright © 2013 John Wiley & Sons, Ltd.