Vortex ring deformation, capture, and entrainment by a columnar vortex
| Autor: | Sean Candon, Jeffrey S. Marshall |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Mathematics::Commutative Algebra Condensed matter physics Mechanical Engineering Computational Mechanics Starting vortex Condensed Matter Physics Ring (chemistry) Vortex shedding Vortex Vortex ring Mechanics of Materials Condensed Matter::Superconductivity Vortex stretching Horseshoe vortex Burgers vortex |
| Zdroj: | Physics of Fluids. 24:093604 |
| ISSN: | 1089-7666 1070-6631 |
| DOI: | 10.1063/1.4753946 |
| Popis: | A vortex ring placed outside of a columnar vortex is stretched by the local straining flow induced by the vortex. This straining flow is known to lead to wrapping of the ring about the columnar vortex, which is a primary feature of multiscale vortex interactions. In this paper we show that continuous stretching of the ring and wrapping about the columnar vortex is only one of the several possible outcomes of vortex ring interaction with a columnar vortex. For cases where the local straining rate of the flow induced by the columnar vortex is sufficiently small, the shape of the vortex ring is found to oscillate between stretching in the principal direction of stretching of the induced flow and stretching in the direction of compression, all while exhibiting an increase in the average ring radius. This oscillatory behavior allows the ring to escape capture and entrainment into the columnar vortex core. In other cases the vortex ring pinches off on itself as it is strained by the columnar vortex. The paper e... |
| Databáze: | OpenAIRE |
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