Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session L11: Boundary Layers: Turbulent I
8:00 AM–10:36 AM,
Monday, November 20, 2023
Room: 143A
Chair: Ricardo Garcia-Mayoral, University of Cambridge
Abstract: L11.00012 : Coles "wake function" revisited and modeled using an offset from the wall
10:23 AM–10:36 AM
Presenter:
Gregoire Winckelmans
(Universite catholique de Louvain (UCLouvain))
Authors:
Gregoire Winckelmans
(Universite catholique de Louvain (UCLouvain))
Matthieu Duponcheel
(Universite catholique de Louvain (UCLouvain))
The DNS data of a ZPG boundary layer at Reτ ≈ 2300 are considered next. The amplitude of the wake function is then much larger than in channel flow. The slope of Q(Y) in its linear part is much larger (α ≈ 7.3) and the intercept is smaller (Yc ≈ 0.11). The finally obtained F(Y) model is seen to also reproduce very well the DNS data.
To comply with some recent literature, we also present a version of the Q(Y) model that incorporates a small linear contribution (of slope α0 much smaller than α) within the overlap layer.
Lastly, we also revisit the simple wake function model that was proposed by Coles, and we show that adding the offset improves it significantly.
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