Aspect ratio influence on the vortex induced vibrations of a pivoted finite height cylinder at low Reynolds number
The effect of the aspect ratio on the vortex induced vibrations (VIV) of a pivoted finite length circular cylinder is investigated. A fixed value of the Reynolds number Re = 100 with four values of the aspect ratio AR=2, 3, 5, 7 is considered. Different values of the reduced velocity u∗r in the rang...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/393465 |
| Acceso en línea: | https://hdl.handle.net/2117/393465 https://dx.doi.org/10.1063/5.0164452 |
| Access Level: | acceso abierto |
| Palabra clave: | Vibration Cylinders Reynolds number Vibració Cilindres Àrees temàtiques de la UPC::Aeronàutica i espai::Aerodinàmica Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
| Sumario: | The effect of the aspect ratio on the vortex induced vibrations (VIV) of a pivoted finite length circular cylinder is investigated. A fixed value of the Reynolds number Re = 100 with four values of the aspect ratio AR=2, 3, 5, 7 is considered. Different values of the reduced velocity u∗r in the range 2≤u∗r≤11 were used for each AR value with a fixed value of the reduced mass m∗r=5. Results on the oscillatory response of the cylinder, hydrodynamic forces, and wake structures are reported. In order to compare the VIV of the different length cylinders, the displacement of the center of mass (which coincides on each case) was analyzed. It is found that the maximum oscillation amplitudes, the extent of the synchronization region, and the wake structures are influenced by the aspect ratio. Also, a steady symmetrical flow is obtained for the small AR=2, 3 cases with relatively low values of u∗r, which is found to be unstable when increasing u∗r. |
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