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Experimental and Numerical Analysis of a Streamwise Vortex Downstream of a Delta Wing

Landa, Tim and Klug, Lorenz and Radespiel, Rolf and Probst, Silvia and Knopp, Tobias (2020) Experimental and Numerical Analysis of a Streamwise Vortex Downstream of a Delta Wing. AIAA Journal, 58 (7), pp. 2857-2868. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.J058650. ISSN 0001-1452.

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Official URL: https://doi.org/10.2514/1.J058650


The present paper analyzes the vortical flow downstream of a delta wing. The delta wing is designed to generate a vortex that resembles the vortex of a nacelle strake. The experimental results of stereoscopic particle image velocimetry measurements performed at different positions downstream of the delta wing display the streamwise development of the vortex. Details of the postprocessing of the measurement data and a quantification of the uncertainties are presented. The evaluation of the mean axial and tangential velocity components and Reynolds stresses provides insights to the vortex characteristics and their development in the streamwise direction. In addition, results of numerical simulations with the DLR TAU-code applying the Menter-Shear Stress Transport (SST) eddy viscosity model and the Speziale-Sarkar-Gatski/Launder-Reece-Rodi (SSG/LRR)-omega Reynolds stress model show the ability of the turbulence models to capture the vortex development. The experimental results indicate a preservation of the vortex strength and structure downstream of the delta wing. The Menter-SST model does not predict this preservation; rather it computes a rapid decay of vortex strength and an increase in vortex size. In contrast, the results of the SSG/LRR-omega model are in good agreement with the experiments concerning the mean flow development. However, both turbulence models underpredict the turbulence in the vortex core.

Item URL in elib:https://elib.dlr.de/136496/
Document Type:Article
Title:Experimental and Numerical Analysis of a Streamwise Vortex Downstream of a Delta Wing
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Landa, TimTU Braunschweig, ISMUNSPECIFIED
Klug, LorenzTU BraunschweigUNSPECIFIED
Radespiel, RolfISM, TU BraunschweigUNSPECIFIED
Probst, Silviasilvia.probst (at) dlr.deUNSPECIFIED
Knopp, TobiasTobias.Knopp (at) dlr.deUNSPECIFIED
Date:25 March 2020
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2514/1.J058650
Page Range:pp. 2857-2868
EditorsEmailEditor's ORCID iD
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:Delta wing; longitudinal vortex; Reynolds stress model; PIV
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 - VicToria (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > CASE, GO
Deposited By: Knopp, Dr.rer.nat. Tobias
Deposited On:14 Oct 2020 11:13
Last Modified:19 Oct 2020 12:53

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