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Wake-Vortex Topology, Circulation, and Turbulent Exchange Processes

Holzäpfel, Frank and Misaka, Takashi and Hennemann, Ingo (2010) Wake-Vortex Topology, Circulation, and Turbulent Exchange Processes. AIAA Atmospheric and Space Environments Conference, 2-5 Aug 2010, Toronto, Ontario, Canada.

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Abstract

Large eddy simulations of aircraft wake vortex evolution in various turbulent and stably stratified atmospheric environments have been conducted with two different LES codes. Passive tracers are used to investigate exchange processes between the vortex cores, the vortex oval and its environment as well as redistribution processes along the vortex tubes. A post processing method is employed to identify the vortex center lines even in progressed states of vortex decay where the coherent vortex structure is getting lost. This method allows, for example, analyzing the circulation evolution of vortex rings, establishing statistics of vortex deformation, and revealing the mechanisms of the vortex bursting phenomenon. Vortex bursting is related to the collision of secondary vorticity structures propagating along the vortex lines. In neutrally and weakly stratified environments long-living vortex rings are observed where circulation decay proceeds in three phases. During the initial diffusion phase vortex decay may depend on integral turbulence length scales. On average, the detrainment of a passive tracer from the primary vortices is correlated with circulation decay.

Document Type:Conference or Workshop Item (Lecture, Paper)
Title:Wake-Vortex Topology, Circulation, and Turbulent Exchange Processes
Authors:
AuthorsInstitution or Email of Authors
Holzäpfel, Frankfrank.holzaepfel@dlr.de
Misaka, TakashiTakashi.Misaka@dlr.de
Hennemann, IngoIngo.Hennemann@dlr.de
Date:August 2010
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 1-16
Editors:
EditorsEmail
Brown, AnthonyAnthony.Brown@nrc-cnrc.gc.ca
Series Name:AIAA Paper 2010-7992
Status:Published
Keywords:wake vortex, vortex rings, vortex topology, circulation, three-phase decay, turbulent mixing, vortex bursting
Event Title:AIAA Atmospheric and Space Environments Conference
Event Location:Toronto, Ontario, Canada
Event Type:international Conference
Event Dates:2-5 Aug 2010
Organizer:American Institute of Aeronautics and Astronautics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Wake Vortices (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Dr.-Ing. Frank Holzäpfel
Deposited On:15 Sep 2010 11:03
Last Modified:24 Sep 2012 12:04

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