| Sumario: | Vortex shedding dynamics and aerodynamic forces of an ellipse of aspect ratio of 0.67 are studied at 0 and 90 relative to the flow across a Reynolds number range of 550–5500. Using time-resolved Shake-The-Box measurements, the evolution of vortex structures is studied together with lift and drag coefficients, Strouhal numbers, and wake characteristics. At 0, the flow remains more attached, leading to lower drag, lower lift fluctuations, and higher shedding frequencies, as indicated by elevated Strouhal numbers. In contrast, at 90, the ellipse behaves as a bluff body, exhibiting stronger separation, higher drag, greater lift fluctuations, and lower shedding frequencies. Proper orthogonal decomposition analysis reveals key vortex distances, showing how separation and wake evolution change with increasing Reynolds number. Additionally, the transition from laminar to turbulent wake structures is observed, with three-dimensional instabilities affecting vortex coherence at high Reynolds numbers. The findings provide insight into the effects of geometry and Reynolds number on vortex-induced forces.
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