dorsal/arxiv
View SchemaHeat equilibrium distribution in a turbulent flow
| Authors | Z. Haba |
|---|---|
| Categories | |
| ArXiv ID | physics/0601130 |
| URL | https://arxiv.org/abs/physics/0601130 |
| DOI | 10.1063/1.2217808 |
Abstract
We consider a shear flow of a scale invariant homogeneous Gaussian random velocity field which does not depend on coordinates in the direction of the flow. We investigate a heat advection coming from a Gaussian random homogeneous source. We discuss a relaxation at large time of a temperature distribution determined by the forced advection-diffusion equation. We represent the temperature correlation functions by means of the Feynman-Kac formula. Jensen inequalities are applied for lower and upper bounds on the correlation functions. We show that at finite time there is no velocity dependence of long range temperature correlations (low momentum asymptotics) in the direction of the flow but the equilibrium heat distribution has large distance correlations (low momentum behaviour) with an index depending on the scaling index of the random flow and of the index of the random forcing. If the velocity has correlations growing with the distance (a turbulent flow) then the large distance correlations depend in a crucial way on the scaling index of the turbulent flow. In such a case the correlations increase in the direction of the flow and decrease in the direction perpendicular to the flow making the stream of heat more coherent.
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"abstract": "We consider a shear flow of a scale invariant homogeneous Gaussian random\nvelocity field which does not depend on coordinates in the direction of the\nflow. We investigate a heat advection coming from a Gaussian random homogeneous\nsource. We discuss a relaxation at large time of a temperature distribution\ndetermined by the forced advection-diffusion equation. We represent the\ntemperature correlation functions by means of the Feynman-Kac formula. Jensen\ninequalities are applied for lower and upper bounds on the correlation\nfunctions. We show that at finite time there is no velocity dependence of long\nrange temperature correlations (low momentum asymptotics) in the direction of\nthe flow but the equilibrium heat distribution has large distance correlations\n(low momentum behaviour) with an index depending on the scaling index of the\nrandom flow and of the index of the random forcing. If the velocity has\ncorrelations growing with the distance (a turbulent flow) then the large\ndistance correlations depend in a crucial way on the scaling index of the\nturbulent flow. In such a case the correlations increase in the direction of\nthe flow and decrease in the direction perpendicular to the flow making the\nstream of heat more coherent.",
"arxiv_id": "physics/0601130",
"authors": [
"Z. Haba"
],
"categories": [
"physics.flu-dyn",
"math-ph",
"math.MP",
"nlin.CD"
],
"doi": "10.1063/1.2217808",
"title": "Heat equilibrium distribution in a turbulent flow",
"url": "https://arxiv.org/abs/physics/0601130"
},
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