POD modes 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.
Karen Mulleners (Institute of Aerodynamics and Flow Technology, German Aerospace Center, Göttingen, Germany)