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Large-Eddy Simulation of Wake Vortex Evolution from Roll-Up to Decay

Misaka, Takashi and Holzäpfel, Frank and Gerz, Thomas (2012) Large-Eddy Simulation of Wake Vortex Evolution from Roll-Up to Decay. DLR-Forschungsbericht, Project Report. DLR-FB--2012-02, 11 S. Deutsches Zentrum für Luft- und Raumfahrt e.V., Bilbliotheks- und Informationswesen, Köln.

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Abstract

The development of an aircraft wake vortex from the roll-up until vortex decay is studied. An aircraft model and the surrounding flow field obtained from high-fidelity Reynolds-averaged Navier-Stokes simulation are swept through a ground-fixed computational domain to initialize the wake. After the wake initialization, the large-eddy simulation of the vortical wake is performed until vortex decay. The methodology is tested with the NACA0012 wing and applied to the DLR-F6 wing-body model. The roll-up process of the vorticity sheet from a main wing and the merge of an inboard wing vortex into the wingtip vortex are simulated. Vortex parameters such as the averaged circulation, vortex core radius and vortex separation are also evaluated. The growth rate of the vortex core radius is relatively small during the roll-up where the fine mesh resolution in the LES is required to capture the tiny vortex core in the RANS simulation. A high-lift configuration of a landing large transport aircraft was also studied where the wingtip vortices merge with the co-rotating and stronger outboard flap vortices.

Document Type:Monograph (DLR-Forschungsbericht, Project Report)
Title:Large-Eddy Simulation of Wake Vortex Evolution from Roll-Up to Decay
Authors:
AuthorsInstitution or Email of Authors
Misaka, TakashiUNSPECIFIED
Holzäpfel, FrankUNSPECIFIED
Gerz, ThomasUNSPECIFIED
Date:February 2012
Journal or Publication Title:The DLR Project Wetter & Fliegen
Number of Pages:11
Editors:
EditorsEmail
Gerz, ThomasUNSPECIFIED
Schwarz, CarstenUNSPECIFIED
Publisher:Deutsches Zentrum für Luft- und Raumfahrt e.V., Bilbliotheks- und Informationswesen, Köln
ISSN:1434-8454
Status:Published
Keywords:wake vortices, roll-up, large-eddy simulation
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: Takashi Misaka
Deposited On:11 Apr 2012 15:40
Last Modified:16 Jul 2012 12:01

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