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http://dx.doi.org/10.5762/KAIS.2017.18.2.71

Study on the Viscous Roll Damping around Circular Cylinder Using Forced Oscillations  

Yang, Seung-Ho (Department of Mechanical Engineering, Ulsan College)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.18, no.2, 2017 , pp. 71-76 More about this Journal
Abstract
The roll damping problem in the design of ships and offshore structures remains a challenge to many researchers due to the fluid viscosity and nonlinearity of the phenomenon itself. In this paper, the study on viscous roll damping of a circular cylinder was carried out using forced oscillations. The roll moment generated by forced oscillation using a torque sensor was measured for each forced oscillation period and compared with the empirical formula. Although the magnitude of the measured torque from the shear force was relatively small, the results were qualitatively similar to those obtained from the empirical formula, and showed good agreement with the quantitative results in some oscillation periods. In addition, the flow around the circular cylinder wall was observed closely through the PIV measurements. Owing to the fluid viscosity, a boundary layer was formed near the wall of the circular cylinder, and a minute wave was generated by periodical forced oscillations at the free surface through the PIV measurement. In this study, the suitability of the empirical formula for the roll moment caused by viscous roll damping was verified by model tests. The wave making phenomenon due to the fluid viscosity around the wall of a circular cylinder was testified by PIV measurements.
Keywords
Circular cylinder; Forced oscillation; PIV measurement; Torque; Viscous roll damping; Wave making phenomenon;
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