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SUMMARY:Riblets drag reduction and rough-wall heat transfer according to m
 inimal channels - Daniel Chung (University of Melbourne)
DTSTART:20220330T083000Z
DTEND:20220330T090000Z
UID:TALK171176@talks.cam.ac.uk
DESCRIPTION:Minimal-channel direct numerical simulations are enabling us t
 o advance beyond the current boundaries of where we stand on rough-wall tu
 rbulence. Because minimal channels resolve only the near-wall turbulence\,
  they are computationally efficient and thus allow us to probe unprecedent
 ed flow regimes and numbers of surfaces that alter drag and heat transfer.
  With these large data sets\, we can assess flow mechanisms generally towa
 rds developing robust predictive models. Here\, I will discuss the Kelvin-
 Helmholtz instability that can limit the drag-reduction performance of rib
 lets and our efforts to replicate the Dipprey and Sabersky (1963) data tha
 t is widely used to calibrate heat and mass transfer models in the fully r
 ough regime.
LOCATION:Seminar Room 1\, Newton Institute
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