Effect of forced motion on the flow past circular cylinder following a figure-8 path

Baranyi, László (2015) Effect of forced motion on the flow past circular cylinder following a figure-8 path. In: Conference on Modelling Fluid Flow (CMFF’15) : The 16 th International Conference on Fluid Flow Technologies. CFD.HU Kft., Budapest, pp. 1-8. ISBN 9789633131909

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Abstract

This numerical study investigates the low-Reynolds-number flow past a circular cylinder placed in a uniform stream following a slender figure-8 path, using a thoroughly tested two-dimensional computational method based on the finite difference method. This type of two-degree-of-freedom motion have often been observed in practice. The combined effects of transverse oscillation amplitude, frequency ratio (0.9, 1.0 and 1.1), amplitude ratio (0.0, 0.1, 0.2, 0.3 and 0.4) and direction of cylinder orbit (clockwise (CW) and anticlockwise (ACW) in the upper loop of figure-8) were investigated at Reynolds number 150 on the mechanical energy transfer and the time-mean values of lift and drag. Results differ substantially depending on the direction of orientation. Mechanical energy transfer between fluid and cylinder was positive (potential danger of vortex-induced vibration) over a much larger parameter domain for ACW direction compared to CW. On the other hand, the CW case is much more prone to the occurrence of vortex switches.

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