Computation of flow around a circular cylinder undergoing two-degree-of-freedom forced motion at low Reynolds number

Baranyi, László (2012) Computation of flow around a circular cylinder undergoing two-degree-of-freedom forced motion at low Reynolds number. In: 10th International Conference on Flow-Induced Vibraton. Trinity College, Dublin, pp. 361-368. ISBN 9780954858346

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Abstract

This study investigates flow around a circular cylinder in forced two-degree-of freedom motion at four different phase angles between the transverse and in-line cylinder motion, at a Reynolds number of 250. Time-mean and rms values of force coefficients and mechanical energy transfer are investigated against frequency ratio in the lock-in domain. Computations were carried out by an in-house finite difference code developed by the author. Results reveal that an increase in phase angle, by bending the figure-eight cylinder path downstream, can reduce drag. Mechanical energy transfer was mostly positive, meaning that energy is transferred from the fluid to the cylinder, leading to a potentially dangerous VIV situation. The change in the initial conditions resulted in hardly any changes in the results.

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