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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2115
DTSTART:20110214T180500Z
DURATION:PT1H0M0S
DTSTAMP:20260420T145933Z
LAST-MODIFIED:20110207T140945Z
LOCATION:2241 Chamberlin Hall
SUMMARY:Turbulent Mixing: Problems\, Concepts\, Solutions\, Plasma Phy
 sics (Physics/ECE/NE 922) Seminar\, Snezhana Abarzhi\, University of C
 hicago
DESCRIPTION:Turbulent mixing plays an important role in a broad variet
 y of plasma systems\, spanning astrophysical to atomistic scales and l
 ow to high energy densities. Examples include inertial confinement fus
 ion\, Z-pinches\, core-collapse supernovae\, thermonuclear stellar fla
 shes\, magneto-convection\, ionospheric plasmas\, and light-material i
 nteraction. Theoretical description of non-equilibrium mixing transpor
 ts is a challenging problem due to singular aspects of the governing (
 Euler or Navier-Stokes) equations. Furthermore these processes are sta
 tistically unsteady and their fluctuating quantities are essentially t
 ime-dependent and non-Gaussian.<br>
\n<br>
\nWe developed a novel theo
 retical concept\, the rate of momentum loss\, and applied it to descri
 be the transports of mass\, momentum and energy in turbulent mixing fl
 ow and to capture its anisotropic and inhomogeneous character. It was 
 shown that invariant\, scaling and spectral properties of unsteady tur
 bulent mixing differ substantially from those of isotropic and homogen
 eous turbulence. Time- and<br>
\nscale-invariance of the rate of momen
 tum loss leads to non-dissipative momentum transfer\, to and power-law
 <br>
\nscale-dependencies of the velocity and Reynolds number and to n
 on-Kolmogorov spectra. Turbulent mixing exhibits more order compared t
 o isotropic turbulence\, and its viscous and dissipation scales are fi
 nite and set by flow acceleration. We suggested how to describe the ra
 ndom character of the statistically unsteady turbulent flow and showed
  that the rate of momentum loss is the statistic invariant and a robus
 t<br>
\ndiagnostic parameter for either sustained or time-dependent ac
 celeration. Some criteria are outlined for the estimate of the fidelit
 y and information capacity of the experimental and numerical data sets
 .<br>
URL:https://www.physics.wisc.edu/events/?id=2115
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