caa a22 4500 60619763X CHVBK 20210128100930.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s00348-015-2001-z doi (NATIONALLICENCE)springer-10.1007/s00348-015-2001-z Detection and tracking of vortex phenomena using Lagrangian coherent structures [Elektronische Daten] [Yangzi Huang, Melissa Green] The formation and shedding of vortices in two vortex-dominated flows around an actuated flat plate are studied to develop a better method of identifying and tracking coherent structures in unsteady flows. The work automatically processes data from the 2D simulation of a flat plate undergoing a $$45^{\circ }$$ 45 ∘ pitch-up maneuver, and from experimental particle image velocimetry data in the wake of a continuously pitching trapezoidal panel. The Eulerian $$\varGamma _1$$ Γ 1 , $$\varGamma _2$$ Γ 2 , and Q functions, as well as the Lagrangian finite-time Lyapunov exponent are applied to identify both the centers and boundaries of the vortices. The multiple vortices forming and shedding from the plates are visualized well by these techniques. Tracking of identifiable features, such as the Lagrangian saddle points, is shown to have potential to identify the timing and location of vortex formation, shedding, and destruction more precisely than by only studying the vortex cores as identified by the Eulerian techniques. Springer-Verlag Berlin Heidelberg, 2015 Vortex detection nationallicence Finite-time Lyapunov exponent nationallicence Unsteady aerodynamics nationallicence Huang Yangzi Syracuse University, 280 Link Hall, 13244, Syracuse, NY, USA aut Green Melissa Syracuse University, 280 Link Hall, 13244, Syracuse, NY, USA aut Experiments in Fluids Springer Berlin Heidelberg 56/7(2015-07-01), 1-12 0723-4864 56:7<1 2015 56 348 https://doi.org/10.1007/s00348-015-2001-z 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/s00348-015-2001-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Huang Yangzi Syracuse University, 280 Link Hall, 13244, Syracuse, NY, USA aut NATIONALLICENCE 700 1- Green Melissa Syracuse University, 280 Link Hall, 13244, Syracuse, NY, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/7(2015-07-01), 1-12 0723-4864 56:7<1 2015 56 348