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A new wall-law for adverse pressure gradient flows and modification of k-omega type RANS turbulence models

Knopp, Tobias (2016) A new wall-law for adverse pressure gradient flows and modification of k-omega type RANS turbulence models. American Institute of Aeronautics and Astronautics. AIAA SciTech 2016 - AIAA Science and Technology Forum and Exposition, 04. - 08. Jan. 2016, San Diego, USA.

Full text not available from this repository.

Official URL: https://www.aiaa-scitech.org/

Abstract

We present an attempt to improve the predictive accuracy of RANS turbulence models for low-speed flow separation on airfoils and wings near stall. It is based on a proposal for a new wall-law for the mean velocity in the inner layer of a turbulent boundary layer at adverse pressure gradient. The wall-law is a composite law with a log-law in the inner part and a half-power (or sqrt-) law in the outer part of the inner layer. The wall law is calibrated using a large experimental database. The slope coefficient for log-law and sqrt-law and the wall distance for transition between them depends on the pressure gradient parameter. We describe the corresponding wall law for the turbulent viscosity and for k and omega in k-omega RANS turbulence models. We propose a modification for the k- and omega-equation such that the wall law for the inner layer is satisfied. We apply the modified SST model to a new turbulent boundary layer experiment and to airfoil flows near maximum lift at different Reynolds numbers. The modification leads to a reduction of the skin-friction coefficient in the adverse pressure gradient region and causes an upstream shift of the separation line.

Item URL in elib:https://elib.dlr.de/100244/
Document Type:Conference or Workshop Item (Speech)
Additional Information:AIAA-2016-
Title:A new wall-law for adverse pressure gradient flows and modification of k-omega type RANS turbulence models
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knopp, Tobiastobias.knopp (at) dlr.deUNSPECIFIED
Date:2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-23
Publisher:American Institute of Aeronautics and Astronautics
Series Name:Conference Proceedings online
Status:Published
Keywords:turbulent boundary layer, adverse pressure gradient, log-law, scaling law, k-omega RANS models
Event Title:AIAA SciTech 2016 - AIAA Science and Technology Forum and Exposition
Event Location:San Diego, USA
Event Type:international Conference
Event Dates:04. - 08. Jan. 2016
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 - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Deposited By: Bachmann, Barbara
Deposited On:26 Sep 2016 15:34
Last Modified:26 Sep 2016 15:34

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