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Modification of turbulence models for pressure-induced separation on smooth surfaces using the DLR VicToria experiment

Knopp, Tobias and Novara, Matteo and Schanz, Daniel and Lühder, Wieland and Schülein, Erich and Geisler, Reinhard and Philipp, Florian and Schroll, Michael and Krumbein, Andreas and Willert, Christian and Schröder, Andreas (2021) Modification of turbulence models for pressure-induced separation on smooth surfaces using the DLR VicToria experiment. 32nd Congress of the International Council of the Aeronautical Sciences ICAS 2021, 6.-10. Sept. 2021, Shanghai.

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Official URL: http://www.icas2020.com/

Abstract

A new experiment of a turbulent boundary layer flow at a large adverse pressure gradient at a high Reynolds number is presented. The strong pressure gradient leads to pressure-induced separation on the smooth surface of the geometry model with a thin separation bubble. The experiment was performed within the DLR internal project VicToria. First, the design of the test case, the set-up in the wind tunnel, and the measurement technique using both large-scale and high-magnification particle imaging and Lagrangian particle tracking are described. Then the experimental results for the mean velocity are described as the flow evolves downstream from the zero-pressure gradient region into the adverse pressure gradient region. From the measurement data a wall law for the mean velocity with a thin log-law region and a half-power law region above the log-law is observed in the adverse pressure gradient region. Then the differential Reynolds stress transport model SSG/LRR-omega is considered. Based on the observation that the length-scale equation is not consistent with the assumed wall laws at adverse-pressure gradient, a modification of the equation for the dissipation rate omega in the model is proposed, so that the modified model can predict the observed wall law at adverse-pressure gradient. Finally, the numerical results using the modified SSG/LRR-omega model are shown. The modification causes a reduction of the mean velocity in the inner part of the boundary layer at adverse-pressure gradients, making the modified model more susceptible for flow separation. The numerical predictions of the modified model are found to be in good agreement with the experimental data.

Item URL in elib:https://elib.dlr.de/143768/
Document Type:Conference or Workshop Item (Speech)
Title:Modification of turbulence models for pressure-induced separation on smooth surfaces using the DLR VicToria experiment
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Knopp, TobiasTobias.Knopp (at) dlr.deUNSPECIFIED
Novara, Matteomatteo.novara (at) dlr.dehttps://orcid.org/0000-0002-8975-0419
Schanz, Danieldaniel.schanz (at) dlr.dehttps://orcid.org/0000-0003-1400-4224
Lühder, WielandWieland.Luehder (at) dlr.dehttps://orcid.org/0000-0002-1483-0211
Schülein, ErichErich.Schuelein (at) dlr.dehttps://orcid.org/0000-0002-1125-8504
Geisler, ReinhardReinhard.Geisler (at) dlr.deUNSPECIFIED
Philipp, FlorianFlorian.Philipp (at) dlr.deUNSPECIFIED
Schroll, MichaelMichael.Schroll (at) dlr.dehttps://orcid.org/0000-0003-0736-546X
Krumbein, AndreasAndreas.Krumbein (at) dlr.dehttps://orcid.org/0000-0002-2772-7328
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Schröder, AndreasAndreas.Schroeder (at) dlr.dehttps://orcid.org/0000-0002-6971-9262
Date:6 September 2021
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-15
Status:Published
Keywords:RANS; turbulent boundary layer; pressure gradient
Event Title:32nd Congress of the International Council of the Aeronautical Sciences ICAS 2021
Event Location:Shanghai
Event Type:international Conference
Event Dates:6.-10. Sept. 2021
Organizer:ICAS International Council of the Aeronautical Sciences
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Digital Technologies
Location: Göttingen , Köln-Porz
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > CASE, GO
Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Knopp, Dr.rer.nat. Tobias
Deposited On:12 Nov 2021 09:23
Last Modified:22 Feb 2022 18:22

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