Reynolds number effects on flow around a cylinder in figure-8-path motion

Baranyi, László (2016) Reynolds number effects on flow around a cylinder in figure-8-path motion. In: Proceedings 11th International Conference on Flow-Induced Vibrations and Noise. FIV 2016, The Hague, pp. 239-246. ISBN 978-90-9029803-0

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Abstract

Forced figure-eight motion of a cylinder placed in an otherwise uniform stream was investigated for both clockwise (CW) and anticlockwise (ACW) directions of orbit in this two-dimensional numerical study for Reynolds numbers Re=50 to 180. Mechanical energy transfer E between the cylinder and fluid, and time-mean and rms values of force coefficients were investigated in the lock-in domain against frequency ratio up to FR=fy/St0=1 using a thoroughly tested finite difference code. It was found that both the direction of orbit and Re have a major effect on lift and mechanical energy transfer. The time-mean value of lift was practically zero over the investigated domain for the ACW case, and mainly positive for the CW orbit and increased with Re. E values were mainly positive for the ACW case, meaning a potential risk of vortex-induced vibration (VIV). E values were negative for the CW case for all Re (no VIV danger).

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