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Skin friction reduction in fully developed turbulent channel flow based on DNS and adjoint shape optimization

Köthe, Thomas and Wagner, Claus (2016) Skin friction reduction in fully developed turbulent channel flow based on DNS and adjoint shape optimization. 11th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements (etmm11), 21. Sep. 2016, Palermo, Sizilien, Italy.

Full text not available from this repository.

Official URL: http://imc.pcz.czest.pl/ercoftac/b108_fin.pdf

Abstract

Direct Numerical Simulations (DNS) of turbulent channel flow are performed with the aim to reduce the skin friction by controlling the near-wall transport processes based on surface modifications. The latter are determined based on the solution of the adjoint Navier-Stokes equations which provides surface sensitivities indicating an improved wall shape. With the modified channel geometry the DNS is continued until a new fully developed state is reached. Time-averaging of the obtained instantaneous wall shapes will finally provide a steady wall shape which interacts with the flow according to a prescribed objective function. Prescribing the turbulence kinetic energy (T KE) as the objective function to be minimized, the approach reduced the T KE by ≈ 11.5% and the driving mean pressure gradient by ≈ 9.7%. The mean pressure drop serves as indicator for the skin friction. Different objective functions are tested to identify flow parameters which are suitable to effectively reduce the skin friction in turbulent channel flow.

Item URL in elib:https://elib.dlr.de/104022/
Document Type:Conference or Workshop Item (Speech)
Additional Information:http://etmm.science/
Title:Skin friction reduction in fully developed turbulent channel flow based on DNS and adjoint shape optimization
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Köthe, Thomasthomas.koethe (at) dlr.deUNSPECIFIED
Wagner, Clausclaus.wagner (at) dlr.deUNSPECIFIED
Date:2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Series Name:Conference Proceedings
Status:Published
Keywords:adjoint shape optimization, direct numerical simulation, optimization
Event Title:11th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements (etmm11)
Event Location:Palermo, Sizilien, Italy
Event Type:international Conference
Event Dates:21. Sep. 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train III (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Bachmann, Barbara
Deposited On:10 Jan 2017 16:02
Last Modified:10 Jan 2017 16:02

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