Dynamic stall analysis of S809 pitching airfoil in unsteady free stream velocity

H. R. Karbasian, S. A. Moshizi, M. J. Maghrebi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


In this paper, the dynamic stall of S809 airfoil that widely used in horizontal axis wind turbine, in different reduced frequencies is investigated. The simulation was carried out numerically handling Navier-Stokes equations. For this purpose, the segregated solver with SIMPLE algorithm was chosen to solve the momentum equations. The effect of turbulence on the flow field is taken into account using Shear Stress Transport (SST) K-ω turbulence model. The obtained numerical results are compared with experimental and a few numerical results. The results indicate that the K-ω SST model is in good agreement with experimental results for both steady and unsteady conditions. Furthermore, a non-dimensional parameter, relating the acceleration of unsteady free stream velocity and acceleration of pitch motion (known as reduced frequency), is also investigated. In addition, the results show that any increase in the reduced frequency increases the instantaneous aerodynamic characteristics of oscillating airfoil.

Original languageEnglish
Pages (from-to)227-235
Number of pages9
JournalJournal of Mechanics
Issue number2
Publication statusPublished - Apr 2016
Externally publishedYes


  • Dynamic stall
  • S809 airfoil
  • Reduced frequency
  • Aerodynamic characteristics


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