Hydrodynamic turbulence as a problem in nonequilibrium statistical mechanics
- 26 November 2012
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 109 (50), 20344-20346
- https://doi.org/10.1073/pnas.1218747109
Abstract
The problem of hydrodynamic turbulence is reformulated as a heat flow problem along a chain of mechanical systems describing units of fluid of smaller and smaller spatial extent. These units are macroscopic but have a few degrees of freedom, and they can be studied by the methods of (microscopic) nonequilibrium statistical mechanics. The fluctuations predicted by statistical mechanics correspond to the intermittency observed in turbulent flows. Specifically, we obtain the formula ζ(p)=p/3-1/Inκ In Γ(p/3 + 1) for the exponents of the structure functions (left angle bracket|Δ(r)V|(p) right angle bracket ~ r(ζ(p)). The meaning of the adjustable parameter κ is that when an eddy of size r has decayed to eddies of size r/κ, their energies have a thermal distribution. The above formula, with (In κ)⁻¹ = .32 ± .01 is in good agreement with experimental data. This lends support to our physical picture of turbulence, a picture that can thus also be used in related problems.This publication has 19 references indexed in Scilit:
- Pressure–velocity correlations and scaling exponents in turbulenceJournal of Fluid Mechanics, 2003
- Exact Free Energy Functional for a Driven Diffusive Open Stationary Nonequilibrium SystemPhysical Review Letters, 2002
- The spatial structure and statistical properties of homogeneous turbulenceJournal of Fluid Mechanics, 1991
- Simple multifractal cascade model for fully developed turbulencePhysical Review Letters, 1987
- From chaos to turbulence in Bénard convectionProceedings of the Royal Society of London. Series A - Mathematical and Physical Sciences, 1987
- Ergodic theory of chaos and strange attractorsReviews of Modern Physics, 1985
- On the multifractal nature of fully developed turbulence and chaotic systemsJournal of Physics A: General Physics, 1984
- Onset of Turbulence in a Rotating FluidPhysical Review Letters, 1975
- On the nature of turbulenceCommunications in Mathematical Physics, 1971
- Sur la géométrie différentielle des groupes de Lie de dimension infinie et ses applications à l'hydrodynamique des fluides parfaitsAnnales de l'institut Fourier, 1966