Abstract
The flow-induced vibrational response of a single flexible cylinder positioned in a seven-row rotated square array of rigid cylinders, with pitch-to-diameter ratio of 2·12, and subject to a cross-flow has been investigated. Experiments have been done with the array in both air- and water-flow. The parameters varied during the experiments include the reduced flow velocity, the upstream flow turbulence, the cylinder non-dimensional mass, the cylinder mechanical damping and the row in which the flexible cylinder is positioned. Measurements were made of the cylinder vibration amplitudes in the in-flow and cross-flow directions; in addition, turbulence measurements were made both upstream and within the array of cylinders. In general, it is found that a single flexible cylinder in this array does not become fluidelastically unstable. It does, however, suffer vibrations both from turbulent buffeting and from resonance with array-induced flow periodicities. Results show that three Strouhal numbers are detected in different parts of the array, with all three occurring for some locations. It was also found that, provided no other excitation mechanism was present, a very good correlation between the upstream flow velocity and the cylinder vibration due to buffeting existed.
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