caa a22 4500 606198520 CHVBK 20210128100934.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s00348-015-2028-1 doi (NATIONALLICENCE)springer-10.1007/s00348-015-2028-1 Dynamic stall on a pitching and surging airfoil [Elektronische Daten] [Reeve Dunne, Beverley McKeon] Vertical axis wind turbine blades undergo dynamic stall due to the large angle of attack variation they experience during a turbine rotation. The flow over a single blade was modeled using a sinusoidally pitching and surging airfoil in a non-rotating frame with a constant freestream flow at a mean chord Reynolds number of $${10^5}$$ 10 5 . Two-dimensional, time-resolved velocity fields were acquired using particle image velocimetry. Vorticity contours were used to visualize shear layer and vortex activity. A low-order model of dynamic stall was developed using dynamic mode decomposition, from which primary and secondary dynamic separation modes were identified. The interaction between these two modes was able to capture the physics of dynamic stall and as such can be extended to other turbine configurations and problems in unsteady aerodynamics. Results from the linear pitch/surge frame are extrapolated to the rotating VAWT frame to investigate the behavior of identified flow structures. Springer-Verlag Berlin Heidelberg, 2015 Dunne Reeve Mechanical Engineering, California Institute of Technology, 1200 E California Blvd, MC 301-46, 91125, Pasadena, CA, USA aut McKeon Beverley Graduate Aerospace Laboratories, California Institute of Technology, 1200 E California Blvd, MC 301-46, 91125, Pasadena, CA, USA aut Experiments in Fluids Springer Berlin Heidelberg 56/8(2015-08-01), 1-15 0723-4864 56:8<1 2015 56 348 https://doi.org/10.1007/s00348-015-2028-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-2028-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dunne Reeve Mechanical Engineering, California Institute of Technology, 1200 E California Blvd, MC 301-46, 91125, Pasadena, CA, USA aut NATIONALLICENCE 700 1- McKeon Beverley Graduate Aerospace Laboratories, California Institute of Technology, 1200 E California Blvd, MC 301-46, 91125, Pasadena, CA, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/8(2015-08-01), 1-15 0723-4864 56:8<1 2015 56 348