  A fluid-structure-interaction (FSI) experiment was designed and executed with
a focus on producing low-frequency (~10 Hz), high-amplitude ($\pm$3.5% of the
span) fin motion. This was achieved by placing a backward facing swept fin at
-9.6{\deg} angle-of-attack within the wake of a roughened cylinder. Test
section speeds between 2.5 and 3.6 m/s produced cylinder diameter based
Reynolds numbers between 190,000 and 280,000, respectively. Detailed
descriptions of the tunnel and model geometry, material/structural behavior,
fluid properties and initial conditions are provided to facilitate development
of FSI models. Given the initial conditions, the resulting forced fin behavior
was characterized with measurements of the mean and fluctuating components of
the flow upstream of the fin (i.e. within the cylinder wake), fin-tip/surface
motion and the fin constraint loading. This work provides a high fidelity
experimental dataset of a challenging flow that will require two-way coupling
in FSI models to properly capture the resulting behavior. Thus this rich
dataset can be used by modelers to identify strengths and weaknesses of various
FSI modeling approaches.
