Abstract

The wakes of rigid pitching panels with a trapezoidal planform geometry, chosen to model idealized fish caudal fins, were investigated using planar Digital Particle Image Velocimetry (DPIV). Experiments were performed for Strouhal numbers of 0.33 and 0.55. The three-dimensional unsteady wake downstream of the panel trailing edge was reconstructed from spatially- and temporally-resolved two-component data. A Lagrangian Coherent Structure (LCS) analysis was employed in addition to Eulerian vortex identification criteria to investigate the formation and evolution of the wake. A classic reverse von

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