Skip to Main content Skip to Navigation
Journal articles

Three-dimensional instability during vortex merging

Abstract : The interaction of two parallel vortices of equal circulation is observed experimentally. For low Reynolds numbers ($Re$), the vortices remain two-dimensional and merge into a single one, when their time-dependent core size exceeds approximately 30\% of the vortex separation distance. At higher $Re$, a three-dimensional instability is discovered, showing the characteristics of an elliptic instability of the vortex cores. The instability rapidly generates small-scale turbulent motion, which initiates merging for smaller core sizes and produces a bigger final vortex than for laminar 2D flow.
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-00081686
Contributor : Patrice Meunier <>
Submitted on : Thursday, June 28, 2007 - 12:33:01 PM
Last modification on : Tuesday, March 30, 2021 - 3:17:48 AM
Long-term archiving on: : Monday, April 5, 2010 - 11:19:23 PM

File

meunierPF1.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Patrice Meunier, Thomas Leweke. Three-dimensional instability during vortex merging. Physics of Fluids, American Institute of Physics, 2001, 13, n° 10, p. 2747-2750. ⟨10.1063/1.1399033⟩. ⟨hal-00081686⟩

Share

Metrics

Record views

310

Files downloads

562