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SUMMARY:Wall-bounded turbulence and the many faces of surface roughness - 
 Angela Busse (University of Glasgow)
DTSTART:20220330T080000Z
DTEND:20220330T083000Z
UID:TALK171173@talks.cam.ac.uk
DESCRIPTION:Rough-wall turbulence can be considered the norm rather than t
 he exception\, because surfaces rarely remain perfectly smooth over longer
  periods of time. Historically\, investigations of rough-wall turbulence h
 ave focussed on the fluid dynamics aspects\, with the wall roughness itsel
 f receiving little attention. More recently\, the topographies of rough wa
 lls and their effects on near-wall turbulence have received increased inte
 rest. Surface skewness and effective slope have been identified as key top
 ographical parameters.\nIn this talk\, I will discuss and classify topogra
 phical parameters that influence the fluid dynamical roughness effect. Usi
 ng results from recent direct numerical simulations I will show that we ne
 ed to consider parameters beyond surface skewness and effective slope to f
 ully capture roughness effects.
LOCATION:Seminar Room 1\, Newton Institute
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