Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/137716
Title: Flow behavior behind a clockwise-and-counterclockwise rotational oscillating cylinder
Authors: Gao, Yangyang
Yang, Kang
Ren, Xingyue
Zhang, Baofeng
Tan, Soon Keat
Keywords: Engineering::Civil engineering
Issue Date: 2018
Source: Gao, Y., Yang, K., Ren, X., Zhang, B., & Tan, S. K. (2018). Flow behavior behind a clockwise-and-counterclockwise rotational oscillating cylinder. Ocean Engineering, 159, 410-421. doi:10.1016/j.oceaneng.2018.04.053
Journal: Ocean Engineering
Abstract: Flow characteristics downstream of a rotational oscillating cylinder at Reynolds number Re = 300 was investigated. The experiments were conducted using a model cylinder in a recirculating open water channel and the flow field was captured by using the Particle Image Velocimetry (PIV) technique. The model cylinder was set to undergo clockwise-and-counterclockwise rotation at selected angular amplitude (angular amplitude α varying from 0° to 360°) and at the lock-on frequency ratio Fr = 1.0 (where Fr = fn/fv, the ratio of the forcing frequency fn to the natural vortex shedding frequency fv). The effects of rotational movement of the cylinder on the near wake downstream of the cylinder were interpreted in terms of the instantaneous vorticity patterns, as well as the time-averaged streamline topology, mean velocity distributions and Reynolds shear stress contours. Based on the observation of the flow patterns and vortex contours, it was deduced that the clockwise-and-counterclockwise rotation produced significant effect on the wake and modified the wake flow structures and vortex shedding patterns. The time-averaged streamline structures appeared to be non-symmetrical about the longitudinal axis of the flow.
URI: https://hdl.handle.net/10356/137716
ISSN: 0029-8018
DOI: 10.1016/j.oceaneng.2018.04.053
Rights: © 2018 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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