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The effect of gusts on aircraft wake vortices – one-way and two-way coupling of RANS and LES codes

Stephan, Anton and Zholtovski, Stefan and Holzäpfel, Frank (2016) The effect of gusts on aircraft wake vortices – one-way and two-way coupling of RANS and LES codes. 6th EASN International Conference, 18.-21. Oktober 2016, Porto, Portugal.

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Abstract

Aircraft wake vortices present a potential risk to following aircraft, particularly during final approach and landing, as wake vortices may remain in the air lane for a long time. Wind and turbulence are the key factors influencing the wake vortex evolution, but also the wake vortex generation behind the aircraft. Flying through a gust influences the wake vortex roll-up process and its evolution. Note that vertical and lateral gusts may affect counter-rotating wake vortices differently. Both vortices influence each other by inducing a downward velocity. Disturbances may therefore lead to local vortex tilting and later to complex three-dimensional deformation. This work employs two different hybrid RANS-LES approaches to investigate the effect of gusts on wake-vortex evolution. In a one-way coupling, a pre-calculated RANS velocity field of the aircraft’s near-field is being swept through an LES domain. The effect of a sine gust on the turbulent wake is modelled by manipulating the RANS-field accordingly. As a more sophisticated approach the concept of two-way coupling is being presented. Here an LES and a URANS solver are coupled bi-directionally, exchanging values at every physical time step.

Item URL in elib:https://elib.dlr.de/107529/
Document Type:Conference or Workshop Item (Speech)
Title:The effect of gusts on aircraft wake vortices – one-way and two-way coupling of RANS and LES codes
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Stephan, AntonDLR, IPAUNSPECIFIED
Zholtovski, StefanDLR, IPAUNSPECIFIED
Holzäpfel, FrankDLR, IPAUNSPECIFIED
Date:2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 642-657
Status:Published
Keywords:Wake Vortex; hybrid RANS-LES; gust encounter
Event Title:6th EASN International Conference
Event Location:Porto, Portugal
Event Type:international Conference
Event Dates:18.-21. Oktober 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
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 > Transport Meteorology
Deposited By: Ziegele, Brigitte
Deposited On:14 Nov 2016 11:28
Last Modified:14 Nov 2016 11:28

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