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/ | |||||||||
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Document Type: | Conference or Workshop Item (Speech) | |||||||||
Title: | Adjoint shape optimization based on DNS of Turbulent Channel Flow | |||||||||
Authors: |
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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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