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SUMMARY:The “core truths” of high-Reynolds-number turbulence - Katepal
 li Sreenivasan (Courant Institute of Mathematical Sciences\, New York Univ
 ersity)
DTSTART:20220105T153000Z
DTEND:20220105T163000Z
UID:TALK166423@talks.cam.ac.uk
DESCRIPTION:The history of turbulence is replete with &ldquo\;truths&rdquo
 \; determined for a range of parameters which\, upon extending the range\,
  are found to need modifications --- perhaps not entirely but in some esse
 ntial ways. As an illustration\, a number of scaling relations in turbulen
 ce display slow changes with the Reynolds number\, and it has been common 
 knowledge that such variations depend loosely on the logarithm of the Reyn
 olds number. Measurements and simulations\, whose importance cannot be ove
 rstated\, often offer less than sterling guidance because they are hard to
  make and suffer from numerous difficulties that are absent at low Reynold
 s numbers. This brings into focus the importance of asymptotic &ldquo\;the
 ories&rdquo\;\, often in the form of potential scenarios. This talk consid
 ers this perspective for a few specific cases from separate domains of tur
 bulence research. It will consider fluctuations in turbulent wall flows (a
 fter a brief comment on mean quantities)\, the veracity of dissipative ano
 maly in homogeneous and isotropic turbulence\, and the scaling of heat tra
 nsport in thermal convection.&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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