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## 摘要

We experimentally investigate the dynamics of decomposed multiscale vortex cores (VCs) as singular objects of the two-dimensional (2D) turbulence driven by the Lorentz force from a direct current electric field and 2D magnetic lattice array. It is found that, in the xyt space, VCs of each mode (i.e., vortex spatial scale) appear as a zoo of unstable wiggling filament arrays with spatially alternating signs of vorticities. VC interaction and the chaotic external Lorentz force for vorticity injection and retraction lead to: (a) the spatial bunching of the VCs of adjacent modes, and the decaying position correlation of VCs with their separation and increasing mode number; (b) single VC dissociation and VC pair recombination, and in turn stretched exponential distributions of VC lifetimes of all modes; (c) similar persistent (super) diffusions of VCs of all modes, associated with persistent changes of the mean square vorticity fluctuations of VCs of the corresponding modes; and (d) the positively correlated instantaneous energy (enstrophy) variations between two neighboring VCs of modes 3 (the scale of the magnetic array for external vorticity injection and retraction) and its harmonics mode 4, and two-way instantaneous energy (enstrophy) exchange of the flow field surrounding VCs of modes 1-2 and modes 2-3.

原文 | ???core.languages.en_GB??? |
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文章編號 | 025102 |

期刊 | Physics of Fluids |

卷 | 36 |

發行號 | 2 |

DOIs | |

出版狀態 | 已出版 - 1 2月 2024 |

## 指紋

深入研究「Lagrangian dynamics of multiscale vortices in electromagnetically driven two-dimensional turbulence」主題。共同形成了獨特的指紋。## 專案

- 1 已完成