Pinch-off of axisymmetric vortex pairs in the limit of vanishing vortex line curvature

Sadri, Vahid; Krueger, Paul S.

doi:10.1063/1.4958814

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…The study of the evolution of opposite-signed vortex pairs has great practical importance as they transport momentum. Such structures have been the focus of a multitude of numerical and experimental studies including the recent works [2][3][4] . Here, we consider the motion of two opposite-signed, finite-size vortices of uniform vorticity, known as FAVOR 5 (Finite Area VOrtex Region), interacting with a fixed point vortex.…”

Section: Introductionmentioning

confidence: 99%

Entrapping of a vortex pair interacting with a fixed point vortex revisited. II. Finite size vortices and the effect of deformation

2018

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We investigate the evolution of a pair of two-dimensional, opposite-signed, finitesize vortices interacting with a fixed point vortex. The present paper builds on the accompanying study [Koshel, K. V., Reinaud, J. N., Riccardi, G. and Ryzhov, E. A. Phys. Fluids (2018)] focusing on the motion of a pair of point vortices impinging on a fixed point vortex. Here, in contrast, the pair of opposite-signed finite-size vortices, or vortex dipole for simplicity, can deform. This deformation has an impact on the dynamics. We show that, as expected, finite size vortices behave like point vortices if they are distant enough from each other. This allows one to recover the rich and diverse set of possible trajectories for the dipole. This includes the regimes of intricate bounded motion when the finite-size vortices remain stable near the fixed vortex for a long time. On the other hand, we show that large finite-size vortices can deform significantly and deviate from the trajectories of equivalent point vortices. When the shear that the vortices induce on each other is large enough, the finite size vortices may break into smaller structures or may even be completely strained out.

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Section: Introductionmentioning

confidence: 99%

Entrapping of a vortex pair interacting with a fixed point vortex revisited. II. Finite size vortices and the effect of deformation

2018

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Formation and behavior of counter-rotating vortex rings

Sadri

Krueger

2017

Theor. Comput. Fluid Dyn.

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Vortical structures and passive scalar transport in starting process of annular purging jet

Cao,

Wang,

Liu

et al. 2024

Physics of Fluids

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The evolution of vortical structures and passive scalar transport in the starting process of annular purging jets are numerically investigated by large eddy simulation. Three flow configurations with different nozzle-to-plate distances at a fixed radius ratio of 0.71 and the Reynolds number of 13 750 are simulated. The numerical results are validated against documented experimental data. Three stages during the evolution are proposed based on instantaneous flow visualizations and assessed by calculating the circulation changes of the annular jets and vortex rings. The vortical structures are identified to understand the three-dimensional characteristics. The entrainment process is analyzed focusing on the passive scalar transport in the flow fields and is correlated with the cleaning performance of annular purging jets. The flow structures dominate the process of scalar mixing, especially the inner and outer vortex rings. The large-scale motions of trailing jets cause the intermittent events of scalar transport. During the starting process, the cleaning performance is better with a smaller nozzle-to-plate distance, while the cleaning efficiency may reach the optimum at a moderate distance. The cleaning process is limited by the scalar diffusion and entrainment process. These findings highlight the significance of flow structures for effective cleanness of temperature and contaminations in the purging systems.

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Pinch-off of axisymmetric vortex pairs in the limit of vanishing vortex line curvature

Cited by 3 publications

References 14 publications

Entrapping of a vortex pair interacting with a fixed point vortex revisited. II. Finite size vortices and the effect of deformation

Entrapping of a vortex pair interacting with a fixed point vortex revisited. II. Finite size vortices and the effect of deformation

Formation and behavior of counter-rotating vortex rings

Vortical structures and passive scalar transport in starting process of annular purging jet

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