Unsteady Fluid Mechanics Benchmark Dataset - Imposed Cylinder Motion at Re=100
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This dataset contains computational fluid dynamics simulation data for the two-dimensional flow past a circular cylinder undergoing an imposed oscillatory motion perpendicular to a uniform incoming cross-flow. All simulations are performed at Reynolds number 100, a regime in which the wake is laminar and remains, to a very good approximation, two-dimensional. The dataset is intended as a benchmark for nonlinear system identification, reduced-order modelling, and data-driven analysis of unsteady fluid mechanics. The system represents a canonical fluid-structure interaction problem in which the cylinder motion is prescribed rather than determined by structural dynamics. This choice makes the problem easier to control computationally and allows systematic exploration of the input space through selected forcing amplitudes and frequencies. The imposed motion acts in the cross-flow direction, while the oncoming flow remains uniform in the streamwise direction. The dataset includes four classes of imposed cylinder motion. The first class consists of swept-sine excitations with linearly varying frequency and constant amplitude. These signals sweep from 0 Hz to 1.5 times the natural …
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