Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Q11: Transitional Flows and Non-linear Dynamics I
3:00 PM–5:00 PM,
Wednesday, March 16, 2022
Room: McCormick Place W-181B
Sponsoring
Unit:
DFD
Chair: Greg Voth, Wesleyan University
Abstract: Q11.00004 : Measurements of turbulence over a streamwise preferential porous medium
3:36 PM–3:48 PM
Presenter:
Mahiro Morimoto
(Osaka Prefecture University)
Authors:
Mahiro Morimoto
(Osaka Prefecture University)
Yuki Okazaki
(Osaka Prefecture University)
Yusuke Kuwata
(Osaka Prefecture University)
Kazuhiko Suga
(Osaka Prefecture University)
We made a layered porous medium whose measured streamwise, wall-normal and spanwise permeabilities are Kxx=26.9, Kyy=1.45, and Kzz=4.26 mm2, respectively. Hence, ψxy = 4.3 and ψzy = 1.7, where ψxy =√(Kxx/Kyy).These values satisfy the drag-reducing condition suggested by numerical studies in the literature. We carry out particle image velocimetry measurements of turbulent square duct flows over the porous medium at the bulk Reynolds numbers of 3000-15000 and examine the drag reduction probability. Although the present experiments do not show a remarkable turbulence reduction over the porous medium, from the detailed analyses of the obtained data, it is confirmed that the present porous medium is suppressed at least to the same level as that of the flat smooth wall side while the near-wall flow structures are different.
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