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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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