Numerical study of an oscillating smaller cylinder in the wake of an upstream larger cylinder |
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Authors: | Yangyang Gao Dingyong Yu Xikun Wang Soon Keat Tan |
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Institution: | , School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore 2) College of Engineering, Ocean University of China, Qingdao 266100, P. R. China 3) Nanyang Environmental and Water Research Institute, Nanyang Technological University, 639798, Singapore |
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Abstract: | A numerical study of flow around two tandem cylinders with unequal diameters was carried out. The upstream larger cylinder
was fixed and the downstream smaller cylinder was allowed to oscillate in the transverse direction only. Comparisons of the
experimental and numerical results were made to investigate the effects of the gap ratio on the maximum vibration amplitude
and vortex shedding frequency. The results showed that the vibration response of the smaller cylinder was significantly affected
by the presence of the upstream larger cylinder, and resulted in greatly reduced vibration amplitudes. With an increasing
gap ratio, the vibration amplitude increased. However, the magnitude was lower than that corresponding to a single cylinder
(with the same diameter as that of the downstream smaller cylinder) under the same flow conditions. |
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Keywords: | tandem cylinders with unequal diameters numerical simulation gap ratio vibration amplitude |
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