Bulletin of the American Physical Society
74th Annual Meeting of the APS Division of Fluid Dynamics
Volume 66, Number 17
Sunday–Tuesday, November 21–23, 2021; Phoenix Convention Center, Phoenix, Arizona
Session P24: Vortex Dynamics and Vortex Flows: Propulsion and Wakes
4:05 PM–6:41 PM,
Monday, November 22, 2021
Room: North 224 B
Chair: Mark Stremler, Virginia Tech
Abstract: P24.00012 : The law of the wake: revisited and modeled using an offset from the wallÂ
6:28 PM–6:41 PM
Presenter:
Gregoire Winckelmans
(Universite catholique de Louvain)
Authors:
Gregoire Winckelmans
(Universite catholique de Louvain)
Matthieu Duponcheel
(Universite catholique de Louvain)
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 the ramp function for Q(Y) is measured as α ≈ 7.3) and the measured intercept is smaller (Yc ≈ 0.11). The finally obtained F(Y) model is again seen to reproduce very well with the DNS data.
To comply with some recent literature, a version of our model is also developed where an added linear contribution (of slope α0 much smaller than α) is added to Q(Y) within the overlap layer.
Lastly, we also revisit the wake function model of Coles, and we show that adding the offset improves it significantly.
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