Thursday
5
Nov
2009
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Physics Colloquium
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Coherence and randomness in non-equilibrium turbulent processes
Snezhana I. Abarzhi, University of Chicago
Non-equilibrium turbulent processes play an important role in a variety of natural and artificial systems, ranging from astrophysical to atomistic scales, under either high or low energy density conditions. Examples include inertial confinement and magnetic fusion, Z-pinches, light-matter interaction and non-equilibrium heat transfer, strong shocks and explosions, material transformation under high strain rate, supernovae and accretion disks, stellar non-Boussinesq and magneto-convection. Theoretical description of non-equilibrium transports is a challenging problem due to singular aspects of the governing (Euler or Navier-Stokes) equations. Furthermore these processes are statistically unsteady and their fluctuating quantities are essentially time-dependent and non-Gaussian. Based on group theory consideration, we apply a theoretical concept of the rate of momentum loss to capture the anisotropic and non-local character of the non-equilibrium dynamics, in particular, in acce
lerating flows and buoyancy-driven Rayleigh-Taylor mixing. It is shown that their invariant, spectral, scaling and statistical properties differ substantially from those of isotropic homogeneous turbulence. We put forward the ideas on how to quantify coherence and randomness in the statistically unsteady non-equilibrium turbulent flows.
Organized By: BCPS
Contact: Grant Bunker
e-mail: bunker@iit.edu
Phone: 312.567.3385
Location: LS 111 |
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