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SUMMARY:Logarithmic profile of the mean turbulent velocity and recent deve
 lopments about its universality. - Paolo Luchini (Università degli Studi 
 di Salerno)
DTSTART:20220303T140000Z
DTEND:20220303T150000Z
UID:TALK170786@talks.cam.ac.uk
DESCRIPTION:When I introduce turbulent flow to my engineering students I b
 egin by the statement that there are properties of it that\, at the presen
 t state of knowledge\, we just can't predict\, and properties that\, despi
 te the lack of a complete mathematical model\, we can predict with a few p
 ercent accuracy. An example of the last category is the mean velocity prof
 ile between parallel plane walls or in a pipe which\, in analogy to the Ko
 lmogorov spectrum of homogeneous turbulence\, can be predicted by dimensio
 nal analysis coupled with a judicious conjecture of what are the relevant 
 physical quantities. Introduced a century ago by Prandtl and perfected by 
 many others\, this is one of the mainstays of the theory and practice of f
 ully developed turbulence\, yet its details have been under scrutiny until
  very recently and this presentation will show some unexpected twists.
LOCATION:Seminar Room 2\, Newton Institute
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