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Title: Wake flow behaviour behind a smaller cylinder oscillating in the wake of an upstream stationary cylinder
Authors: Gao, Yangyang
Sun, Zhilin
Tan, Danielle S
Yu, Dingyong
Tan, Soon Keat
Keywords: DRNTU::Engineering::Civil engineering::Water resources
Issue Date: 2014
Source: Gao, Y., Sun, Z., Tan, D. S., Yu, D., & Tan, S. K. (2014). Wake flow behaviour behind a smaller cylinder oscillating in the wake of an upstream stationary cylinder. Fluid dynamics research, 46(2), 025505-.
Series/Report no.: Fluid dynamics research
Abstract: The flow patterns around a cylinder oscillating freely in the wake of a larger cylinder upstream were investigated using the particle image velocimetry technique. The upstream cylinder was fixed at both ends while the downstream smaller cylinder was held by springs such that it was free to oscillate in the transverse direction. The flow patterns, amplitudes of oscillation and vortex shedding frequencies were compared with those of a single cylinder. In the presence of the upstream cylinder, the three parameters characterizing the oscillation response of the smaller cylinder—amplitude of oscillation, vortex shedding frequency and Reynolds stresses—were greatly reduced. While their magnitude increased with gap ratio, these three parameters were still smaller than the corresponding magnitudes for a single oscillating cylinder. The peak values of turbulence statistics such as Reynolds shear stress and normal stress behind the oscillating downstream cylinder were similarly reduced, and increased with gap ratios.
DOI: 10.1088/0169-5983/46/2/025505
Rights: © 2014 Fluid Dynamics Research. This is the author created version of a work that has been peer reviewed and accepted for publication by Fluid Dynamics Research. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:NEWRI Journal Articles

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