Vortex bursting and tracer transport of a counter-rotating vortex pair

T. Misaka, F. Holzäpfel, I. Hennemann, T. Gerz, M. Manhart, F. Schwertfirm

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)

Abstract

Large-eddy simulations of a coherent counter-rotating vortex pair in different environments are performed. The environmental background is characterized by varying turbulence intensities and stable temperature stratifications. Turbulent exchange processes between the vortices, the vortex oval, and the environment, as well as the material redistribution processes along the vortex tubes are investigated employing passive tracers that are superimposed to the initial vortex flow field. It is revealed that the vortex bursting phenomenon, known from photos of aircraft contrails or smoke visualization, is caused by collisions of secondary vortical structures traveling along the vortex tube which expel material from the vortex but do not result in a sudden decay of circulation or an abrupt change of vortex core structure. In neutrally stratified and weakly turbulent conditions, vortex reconnection triggers traveling helical vorticity structures which is followed by their collision. A long-lived vortex ring links once again establishing stable double rings. Key phenomena observed in the simulations are supported by photographs of contrails. The vertical and lateral extents of the detrained passive tracer strongly depend on environmental conditions where the sensitivity of detrainment rates on initial tracer distributions appears to be low.

Original languageEnglish
Article number025104
JournalPhysics of Fluids
Volume24
Issue number2
DOIs
Publication statusPublished - 2012 Feb 3

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Fingerprint Dive into the research topics of 'Vortex bursting and tracer transport of a counter-rotating vortex pair'. Together they form a unique fingerprint.

Cite this