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Modification of the SSG/LRR-omega RSM for adverse pressure gradients using turbulent boundary layer experiments at high Re

Knopp, Tobias and Novara, Matteo and Schanz, Daniel and Reuther, Nico and Lühder, Wieland and Willert, Christian and Schröder, Andreas and Schülein, Erich and Hain, Rainer and Kähler, Christian (2021) Modification of the SSG/LRR-omega RSM for adverse pressure gradients using turbulent boundary layer experiments at high Re. In: 13th International ERCOFTAC symposium on engineering, turbulence, modelling and measurements ETMM13, pp. 1-6. The 13th International ERCOFTAC symposium on engineering, turbulence, modelling and measurements, 15.-17. September 2021, Rhodes.

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Official URL: http://etmm.ercoftac.org/etmm13/

Abstract

A modification of the SSG/LRR-omega model for turbulent boundary layers in adverse pressure gradient is presented. The modification is based on a new wall law for the mean velocity at adverse pressure gradient. The wall law is found from two new joint DLR/UniBw experiments and from the analysis of a data base from the literature. The mean velocity profile in the inner layer is found to consist of a log-law region, which is thinner than its zero pressure gradient counterpart, and a half-power law region above the log law. An empirical correlation for the wall-distance of the transition from the log-law to the half-power law is presented. Then a modification of the omega-equation to account for a half-power law behaviour of the mean velocity is described. The modified SSG/LRR-omega model is then applied to the two joint DLR/UniBw experiments. The modification leads to a reduction of the mean velocity in the inner part of the boundary layer and makes the model more susceptible for flow separation, which is in good agreement with the experimental data.

Item URL in elib:https://elib.dlr.de/136561/
Document Type:Conference or Workshop Item (Speech)
Title:Modification of the SSG/LRR-omega RSM for adverse pressure gradients using turbulent boundary layer experiments at high Re
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Knopp, Tobiastobias.knopp (at) dlr.dehttps://orcid.org/0000-0002-3161-5353
Novara, Matteomatteo.novara (at) dlr.dehttps://orcid.org/0000-0002-8975-0419
Schanz, Danieldaniel.schanz (at) dlr.dehttps://orcid.org/0000-0003-1400-4224
Reuther, NicoUni Bw MünchenUNSPECIFIED
Lühder, WielandWieland.Luehder (at) dlr.dehttps://orcid.org/0000-0002-1483-0211
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Schröder, AndreasAndreas.Schroeder (at) dlr.dehttps://orcid.org/0000-0002-6971-9262
Schülein, ErichErich.Schuelein (at) dlr.dehttps://orcid.org/0000-0002-1125-8504
Hain, RainerUni Bw MünchenUNSPECIFIED
Kähler, ChristianUni Bw MünchenUNSPECIFIED
Date:15 September 2021
Journal or Publication Title:13th International ERCOFTAC symposium on engineering, turbulence, modelling and measurements ETMM13
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-6
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDERCOFTACUNSPECIFIED
Status:Published
Keywords:Turbulent boundary layer; PIV; RANS turbulence modelling; adverse pressure gradient; log law; half power law; square-root law; SSG/LRR-omega model
Event Title:The 13th International ERCOFTAC symposium on engineering, turbulence, modelling and measurements
Event Location:Rhodes
Event Type:international Conference
Event Dates:15.-17. September 2021
Organizer:ERCOFTAC
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 12:16
Last Modified:22 Feb 2022 18:22

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