elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

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

Misaka, Takashi and Holzäpfel, Frank and Hennemann, Ingo and Gerz, Thomas and Manhart, Michael and Schwertfirm, Florian (2012) Vortex bursting and tracer transport of a counter-rotating vortex pair. Physics of Fluids, 24 (025104), pp. 1-21. DOI: 10.1063/1.3684990.

[img] PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
691kB

Official URL: http://link.aip.org/link/?PHF/24/025104

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.

Document Type:Article
Title:Vortex bursting and tracer transport of a counter-rotating vortex pair
Authors:
AuthorsInstitution or Email of Authors
Misaka, TakashiDLR
Holzäpfel, FrankDLR
Hennemann, IngoDLR
Gerz, ThomasDLR
Manhart, MichaelTU München
Schwertfirm, FlorianKreuzinger+Manhart Turbulenz GmbH
Date:27 February 2012
Journal or Publication Title:Physics of Fluids
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:24
DOI:10.1063/1.3684990
Page Range:pp. 1-21
Status:Published
Keywords:aircraft, collision processes, flow simulation, stratified flow, turbulence, vortices
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Takashi Misaka
Deposited On:06 Mar 2012 10:27
Last Modified:07 Feb 2013 20:39

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.