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UID:fc07c8598f97882ea03f567b2cdef3fd
CATEGORIES:Mathematical Physics Seminar
CREATED:20220321T142940
SUMMARY:Turbulence: from the basics to slightly beyond
LOCATION:Zoom
DESCRIPTION:<p>In the landscape of physics, turbulence stands in a rather unique place.
  The problems it attempts to solve can be traced back to Newton's Principia
  with slow progress afterwards even though<br />1) the equations to be solv
 ed are well-known (Euler eq. for inviscid fluids, Navier-Stokes with viscos
 ity) <br />2) The range of applications is huge, from moving objects to wea
 ther and climate studies<br />Over the last forty years, big progress in th
 e understanding of the transition from laminar (not time dependent) to turb
 ulent flows. Dynamical system theory yields a fair understanding of transit
 ion in small boxes (the "routes to chaos").In systems with many degrees of 
 freedom (like parallel flows or pipe flows) the transition is continuous an
 d follows the directed percolation scenario, which explains observations ma
 de in 1888 by Osborne Reynolds. <br />There remains to understand the regim
 e of very large Reynolds numbers, very far from the onset of stability. I'l
 l discuss the modeling of this regime, namely the way momentum is exchanged
  by interaction between turbulent fluctuations, the so-called closure probl
 em, in a concrete situation.</p>
CONTACT:Yves Pomeau - French National Centre for Scientific Research
DTSTAMP:20260828T140116
DTSTART;TZID=America/New_York:20220330T104500
DTEND;TZID=America/New_York:20220330T114500
SEQUENCE:0
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