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Adjoint shape optimization based on DNS of Turbulent Channel Flow

Köthe, Thomas and Wagner, Claus (2016) Adjoint shape optimization based on DNS of Turbulent Channel Flow. 24th International Congress of Theoretical and Applied Mechanics (ICTAM), 21. - 26. Aug. 2016, Montréal, Canada.

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Official URL: http://www.ictam2016.org

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 optimal wall shape. With the modified geometry the DNS is continued until a new fully developed state is reached. Time-averaging of the instantaneous wall shapes produced with this approach will finally lead to a steady wall shape which controls the flow according to a prescribed objective function. Considering that the objective function turbulence kinetic energy (TKE) is minimized, the approach produced a reduction of 9.3% and a mean pressure gradient, required to drive the flow, which is reduced by 7.5%. Currently, 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/102876/
Document Type:Conference or Workshop Item (Speech)
Title:Adjoint shape optimization based on DNS of Turbulent Channel Flow
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
Status:Published
Keywords:Adjoint methods, shape optimization, skin friction reduction
Event Title:24th International Congress of Theoretical and Applied Mechanics (ICTAM)
Event Location:Montréal, Canada
Event Type:international Conference
Event Dates:21. - 26. Aug. 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:02 Dec 2016 12:56
Last Modified:02 Dec 2016 12:56

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