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SUMMARY:Turbulence over drag-reducing\, anisotropically permeable substrat
 es - Dr. Ricardo Garcia-Mayoral\, University of Cambridge
DTSTART:20200228T130000Z
DTEND:20200228T140000Z
UID:TALK138412@talks.cam.ac.uk
CONTACT:Connor O'Pray
DESCRIPTION:This talk will mainly review the PhD thesis of Garazi Gómez-d
 e-Segura on anisotropic permeable substrates. Similar to riblets\, these s
 ubstrates are conceived to produce a change in drag through two competing 
 mechanisms. The first\, which is drag-reducing\, consists in imposing diff
 erent apparent origins to the mean flow and the turbulent fluctuations. Th
 e second\, which is drag increasing\, consists in the excitation of a Kelv
 in-Helmholtz-like instability just above the substrate. We will present re
 sults from direct simulations\, which show that these surfaces can substan
 tially outperform riblets\, while exhibiting the same drag-altering mechan
 isms\, by exploiting them more optimally. We will also present low-order m
 odels\, obtained from linear analysis\, which predict accurately the perfo
 rmance of these substrates.\n
LOCATION:LR5\, Baker Building\, CUED.
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