CFD Investigation of Separation Control on a Vertical Axis Wind Turbine: Steady and Unsteady Suction

Abdolrahim Rezaeiha (Corresponding author), Hamid Montazeri, Bert Blocken

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


High-fidelity two-dimensional unsteady Reynolds-averaged Navier-Stokes (URANS) simulations are employed to investigate the influence of boundary layer suction through a slot located near the leading edge of a vertical axis wind turbine operating in dynamic stall. The analysis includes both steady and unsteady suction with different frequencies. The results shows that: (i) when the suction slot is located within the chordwise extent of the laminar separation bubble, dynamic stall can be avoided with minimal suction amplitude; (ii) the most promising suction location is the most upstream suction location studied, at 8.5%c where c is the blade chord length; (iii) the suction only needs to be applied during the azimuthal angles when dynamic stall occurs; (iv) the oscillation frequency of the suction velocity has insignificant influence on the obtained turbine power gain; (v) applying unsteady suction is interesting as it reduces the energy consumption of the suction system, thus the net power gain.

Original languageEnglish
Article number052019
Number of pages11
JournalJournal of Physics: Conference Series
Issue number5
Publication statusPublished - 22 Sept 2020
EventScience of Making Torque from Wind 2020, TORQUE 2020 - Virtual, Online, Netherlands
Duration: 28 Sept 20202 Oct 2020


  • Active flow control
  • aerodynamics
  • boundary layer suction
  • power enhancement
  • smart rotor


Dive into the research topics of 'CFD Investigation of Separation Control on a Vertical Axis Wind Turbine: Steady and Unsteady Suction'. Together they form a unique fingerprint.

Cite this