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Simulation Study of Severity and Mitigation of Wake-Vortex Encounters in Ground Proximity

Vechtel, Dennis and Stephan, Anton and Holzäpfel, Frank (2017) Simulation Study of Severity and Mitigation of Wake-Vortex Encounters in Ground Proximity. Journal of Aircraft, 54 (5), pp. 1802-1813. American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.C033995 ISSN 0021-8669

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Official URL: https://arc.aiaa.org/doi/10.2514/1.C033995


Wake-vortex encounter reports as well as simulations show a significantly higher encounter probability during landing shortly before touchdown in comparison to other flight phases. This is caused, among other factors, by the special behavior of wake vortices in ground effect. Nevertheless, hazardous wake encounters with adverse consequences are rarely reported in reality. To gain more insight in the mechanisms of wake encounters close to ground, encounter simulations were performed with realistic vortex flowfields. These were generated using coupled Reynolds-averaged Navier–Stokes and large-eddy simulations covering the whole vortex evolution in ground effect from generation until decay and were used for a hazard analysis. Encounter simulations were performed with a simulation model of an A320-size aircraft with autopilot engaged following an A340-size aircraft. Different wind conditions and vortex ages were considered as well as a so-called plate line. Recent studies showed increased vortex decay when a series of plates is positioned in front of the runway threshold. The results of the study reveal a significant reduction of the maximal vortex impact on the encountering aircraft due to the plate line. This effect is more pronounced for younger vortices, but also for operationally relevant vortex ages, a considerable effect of the plate lines in reducing the maximum aircraft reaction due to a wake encounter close to ground can be observed.

Item URL in elib:https://elib.dlr.de/112653/
Document Type:Article
Title:Simulation Study of Severity and Mitigation of Wake-Vortex Encounters in Ground Proximity
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Holzäpfel, FrankDLR, IPAhttps://orcid.org/0000-0003-3182-1832
Date:May 2017
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2514/1.C033995
Page Range:pp. 1802-1813
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:Wake Vortex, Ground Effect, Flight Simulation, Hazard Analysis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin
Location: Braunschweig , Oberpfaffenhofen
Institutes and Institutions:Institute of Flight Systems > Flight Dynamics and Simulation
Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Vechtel, Dennis
Deposited On:12 Jun 2017 17:54
Last Modified:24 Jan 2020 11:36

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