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Large-Eddy Simulation of Aircraft Wake Vortex Deformation and Topology

Hennemann, Ingo and Holzäpfel, Frank (2011) Large-Eddy Simulation of Aircraft Wake Vortex Deformation and Topology. Journal of Aerospace Engineering, 25, pp. 1336-1350. DOI: 10.1177/0954410011402257.

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Official URL: http://ascelibrary.org/aso/resource/1/jaeeez

Abstract

On the one hand, it is known from visual observations, Lidar measurements, and numerical simulations that aircraft wake vortices may live significantly longer than anticipated by todays standard regulations of air traffic control. On the other hand, the initially counter-rotating, parallel vortex pair deforms quickly, which reduces the impact time of adverse forces and moments on encountering aircraft. Therefore, Large-Eddy simulations of wake vortex evolution in different meteorological conditions are conducted in order to analyse the physics of vortex deformation. A new post-processing algorithm has been developed that at first determines the three-dimensional path of the vortex core line and then computes piecewise curvature radii as a measure of vortex deformation. It is found that larger turbulence levels and neutral to weakly stable temperature stratification particularly support vortex ring formation. The vortex ring regime is characterised by a reduced descent rate and by a surprising variability of its core radius. It is shown that the varying core size directly affects the evolution of radii-averaged circulation. Comparisons with field experiments indicate good agreement with the considerable life time of the vortex rings and topology.

Document Type:Article
Title:Large-Eddy Simulation of Aircraft Wake Vortex Deformation and Topology
Authors:
AuthorsInstitution or Email of Authors
Hennemann, Ingoingo.hennemann@dlr.de
Holzäpfel, Frankfrank.holzaepfel@dlr.de
Date:2011
Journal or Publication Title:Journal of Aerospace Engineering
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:25
DOI:10.1177/0954410011402257
Page Range:pp. 1336-1350
Status:Published
Keywords:wake vortex, circulation, deformation, curvature radius, linking, turbulent length scales, baroclinic vorticity
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: Ingo Hennemann
Deposited On:13 Dec 2010 12:37
Last Modified:12 Dec 2013 21:09

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