266
Views
2
CrossRef citations to date
0
Altmetric
Original Articles

Vortex rings moving into turbulence

, &
Pages 190-202 | Received 02 May 2012, Accepted 11 Dec 2012, Published online: 14 Mar 2013
 

Abstract

We report on an experimental study of turbulent vortex rings injected with velocity U v0 into a grid-generated turbulent flow (with RMS streamwise velocity u *) and followed relative to the mean flow. The initial Reynolds number of the vortices varies from 4500 to 11,500. The turbulence was characterised by an intensity It =u */U v0, which varied over the range 0<It <0.03. A mathematical model based on a stochastic model of the vortex core is developed to explain and interpret the results. The vortex radius grows diffusively in time with the rate of increase of the square of the vortex radius increasing linearly with It . As the vortices grow, they slow down sufficiently rapidly in a manner that they penetrate a finite distance into the turbulence. The vortex velocity, averaged over many experiments, showed an initial t −1 decay, consistent with Maxworthy’s experiments. The analysis and experiments show that such vortices ultimately only move a finite distance from their point of generation and this distance varies inversely with It .

Acknowledgments

Acknowledgements

OA is indebted to Prof. Dr. Eduard Naudascher (University of Karlsruhe). CAK acknowledges support from ASTAR.

Log in via your institution

Log in to Taylor & Francis Online

PDF download + Online access

  • 48 hours access to article PDF & online version
  • Article PDF can be downloaded
  • Article PDF can be printed
USD 61.00 Add to cart

Issue Purchase

  • 30 days online access to complete issue
  • Article PDFs can be downloaded
  • Article PDFs can be printed
USD 146.00 Add to cart

* Local tax will be added as applicable

Related Research

People also read lists articles that other readers of this article have read.

Recommended articles lists articles that we recommend and is powered by our AI driven recommendation engine.

Cited by lists all citing articles based on Crossref citations.
Articles with the Crossref icon will open in a new tab.