000014707 001__ 14707
000014707 005__ 20161115100159.0
000014707 04107 $$aeng
000014707 046__ $$k2016-08-21
000014707 100__ $$aKöthe, Thomas
000014707 24500 $$aAdjoint shape optimization based on DNS of turbulent channel flow

000014707 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014707 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014707 506__ $$arestricted
000014707 520__ $$2eng$$aDirect 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.

000014707 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014707 653__ $$a

000014707 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014707 720__ $$aKöthe, Thomas
000014707 8560_ $$ffischerc@itam.cas.cz
000014707 8564_ $$s145066$$uhttps://invenio.itam.cas.cz/record/14707/files/TS.FM13-1.06.pdf$$yOriginal version of the author's contribution as presented on CD,  page 1340, code TS.FM13-1.06
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000014707 962__ $$r13812
000014707 980__ $$aPAPER