The collective motions of numerous free-oscillating cylinders are examined through numerical simulations using computational fluid dynamics. These one-degree-of-freedom cylinders can oscillate perpendicular to the direction of the incoming flow, with no structural damping or stiffness. They are placed in a uniform cross-flow at a Reynolds number of 100 with the upstream stationary cylinder acting as a leader in this setup. Configurations include inline and symmetric circular and triangular arrays as well as symmetric and asymmetric V-shape arrangements. The comparisons between fixed and free-oscillating cylinder configurations serve to highlight the reconfigurations present when there is no stiffness or damping of the structures. Using lighter cylinders increases the amplitude of oscillations, however the overall final arrangements are similar.
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