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Simulation study of wake encounters with straight and deformed vortices

Vechtel, Dennis (2016) Simulation study of wake encounters with straight and deformed vortices. The Aeronautical Journal, 120 (1226), pp. 651-674. Cambridge University Press. DOI: 10.1017/aer.2016.14 ISSN 0001-9240

Full text not available from this repository.

Official URL: http://journals.cambridge.org/abstract_S0001924016000142

Abstract

A simulation study was conducted in order to investigate the influence of vortex deformation on wake encounter characteristics. Wake vortices tend to be strongly deformed during the decay process, depending on the atmospheric conditions in terms of turbulence and thermal stratification. For quantification of the influence of vortex deformation, encounters of an aircraft of the ‘Medium’ category behind a generator aircraft of the ‘Heavy’ category were simulated with straight vortices and with realistically deformed vortices derived from large-eddy-simulations. All relevant parameters that influence the encounter characteristics, such as encounter angles and positions, were varied within a wide range. In order to cover all kinds of vortex deformation, encounters with different vortex ages from 16-136 seconds were simulated. Hence, all relevant phases during the vortex decay from nearly straight and wavy vortices to vortex rings were considered. The parameter variation study revealed that on average the impact on the encountering aircraft is less with deformed vortices than with straight vortices of comparable strength. Especially with vortex rings, the encountering aircraft is exposed to a much smaller impact. However, the results also show a larger aircraft response during encounters with wavy vortices just prior to vortex linking. The maximum aircraft response with wavy vortices is stronger than with straight vortices of comparable strength. Also, the strongest encounters occur under greater encounter angles with deformed vortices than with straight ones.

Item URL in elib:https://elib.dlr.de/104140/
Document Type:Article
Title:Simulation study of wake encounters with straight and deformed vortices
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Vechtel, DennisDLR-FT-FDSUNSPECIFIED
Date:April 2016
Journal or Publication Title:The Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:120
DOI :10.1017/aer.2016.14
Page Range:pp. 651-674
Publisher:Cambridge University Press
ISSN:0001-9240
Status:Published
Keywords:Vortex deformation; hazard assessment; encounter simulation
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
Institutes and Institutions:Institute of Flight Systems > Flight Dynamics and Simulation
Deposited By: Vechtel, Dennis
Deposited On:27 Apr 2016 09:09
Last Modified:10 Jan 2019 15:51

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