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), 2016-08-21 - 2016-08-26, 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 Start Date: | 21 August 2016 | ||||||||||||
Event End Date: | 26 August 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: | 24 Apr 2024 20:08 |
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