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Wake-Vortex Topology, Circulation, and Turbulent Exchange Processes

Holzäpfel, Frank and Misaka, Takashi and Hennemann, Ingo (2012) Wake-Vortex Topology, Circulation, and Turbulent Exchange Processes. DLR-Forschungsbericht, Project Report. DLR-FB--2012-02, 14 S. DLR, Bilbliotheks- und Informationswesen, Köln.

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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:Monograph (DLR-Forschungsbericht, Project Report)
Title:Wake-Vortex Topology, Circulation, and Turbulent Exchange Processes
Authors:
AuthorsInstitution or Email of Authors
Holzäpfel, Frank UNSPECIFIED
Misaka, Takashi UNSPECIFIED
Hennemann, Ingo UNSPECIFIED
Date:February 2012
Journal or Publication Title:The DLR Project Wetter & Fliegen
Number of Pages:14
Editors:
EditorsEmail
Gerz, ThomasUNSPECIFIED
Schwarz, CarstenUNSPECIFIED
Publisher:DLR, Bilbliotheks- und Informationswesen, Köln
ISSN:1434-8454
Status:Published
Keywords:wake vortex, LES
Institution:DLR
Department:Institute für Physik der Atmosphäre
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: Jana Freund
Deposited On:12 Jul 2012 18:34
Last Modified:12 Jul 2012 18:34

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