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Velocity, vorticity, and FTLE fields representing the different stages of the dynamic
stall life cycle: attached flow (row 1), emergence of flow reversal and shear layer growth (row 2),
shear layer roll-up (row 3), stall onset (row 4), and flow reattachment (row 5).

Stages of Dynamic Stall

Three most dominant POD modes representing an attached flow state (Psi_1), a separated
flow state (Psi_2), and the dynamic stall vortex (Psi_3). The associated time development coefficients, normalised with the square root of twice the eigenvalue, indicate the temporal evolution of the relative contributions of the individual modes within a single pitching period T. The pitch angle history is added in the background in grey for reference.

POD modes of Dynamic Stall

Contributed by:
Karen Mulleners (Institute of Aerodynamics and Flow Technology, German Aerospace Center, Göttingen, Germany)