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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Park, Hongrae Michael, M. Bernitsas Kumar, R. Ajith |
| Copyright Year | 2011 |
| Abstract | A passive control means to suppress flow-induced motions (FIM) of a rigid circular cylinder in the TrSL3, high-lift, flow regime is formulated and tested experimentally. The method developed uses passive turbulence control (PTC) consisting of selectively located roughness on the cylinder surface with thickness about equal to the boundary layer thickness. The map of “PTC-to-FIM”, developed in previous work, revealed robust zones of weak suppression, strong suppression, hard galloping, and soft galloping. PTC has been used successfully to enhance FIM for hydrokinetic energy harnessing using the VIVACE Converter. The same technology revealed the potential to suppress FIM to various levels. The map is flow-direction dependent. In this paper, the “PTC-to-FIM” map is used to guide development of FIM suppression devices that are flow-direction independent and hardly affect cylinder geometry. Experiments are conducted in the Low Turbulence Free Surface Water Channel of the University of Michigan on a rigid, horizontal, circular cylinder, suspended on springs. Amplitude and frequency measurements and broad field-of-view visualization reveal complex flow structures and their relation to suppression. Several PTC designs are tested to understand PTC direction, roughness, thickness, and coverage. Gradual modification of PTC parameters, leads to improved suppression and evolution of a design reducing the VIV synchronization range, fully suppressing VIV in a wide range, and reducing the maximum occurring near the system’s natural frequency by about 60% compared to the maximum amplitude of the smooth cylinder. |
| Sponsorship | Ocean, Offshore and Arctic Engineering Division |
| Starting Page | 715 |
| Ending Page | 724 |
| Page Count | 10 |
| File Format | |
| ISBN | 9780791844397 |
| DOI | 10.1115/OMAE2011-50302 |
| Volume Number | Volume 7: CFD and VIV; Offshore Geotechnics |
| Conference Proceedings | ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering |
| Language | English |
| Publisher Date | 2011-06-19 |
| Publisher Place | Rotterdam, The Netherlands |
| Access Restriction | Subscribed |
| Subject Keyword | Water Visualization Turbulence Surface roughness Passive control Synchronization Flow (dynamics) Circular cylinders Vortex-induced vibration Design Geometry Hydropower Springs Boundary layers Cylinders |
| Content Type | Text |
| Resource Type | Article |
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