Hydrodynamic fluctuations in the Kolmogorov flow: Linear regime

Details Hydrodynamic fluctuations in the Kolmogorov flow: Linear regime Hydrodynamic fluctuations in the Kolmogorov flow: Linear regime

2001-09-05

arxiv.org/abs/cond-mat/0109081v1

Phys. Rev. E 59, 5503 - 5510 (1999)

Physics

Condensed Matter

20 pages, 4 figures

Scientific paper

10.1103/PhysRevE.59.5503

The Landau-Lifshitz fluctuating hydrodynamics is used to study the statistical properties of the linearized Kolmogorov flow. The relative simplicity of this flow allows a detailed analysis of the fluctuation spectrum from near equilibrium regime up to the vicinity of the first convective instability threshold. It is shown that in the long time limit the flow behaves as an incompressible fluid, regardless of the value of the Reynolds number. This is not the case for the short time behavior where the incompressibility assumption leads in general to a wrong form of the static correlation functions, except near the instability threshold. The theoretical predictions are confirmed by numerical simulations of the full nonlinear fluctuating hydrodynamic equations.

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