dorsal/arxiv
View SchemaNumerical simulations studies of the convective instability onset in a supercritical fluid
| Authors | Akira Furukawa, Horst Meyer, Akira Onuki |
|---|---|
| Categories | |
| ArXiv ID | physics/0411187 |
| URL | https://arxiv.org/abs/physics/0411187 |
| DOI | 10.1103/PhysRevE.71.067301 |
Abstract
Numerical simulation studies in 2D with the addition of noise are reported for the convection of a supercritical fluid,3He, in a Rayleigh-Be'nard cell where the fluid parameters and cell height L are the same as in published laboratory experiments. The noise addition is to accelerate the instability onset after starting the heat flow across the fluid, so as to bring simulations into better agreement with experimental observations. Homogeneous temperature noise and spatial lateral periodic temperature variations in the top plate were programmed into the simulations. A speed-up in the instability onset was obtained, which was most effective through the spatial temperature variations with a period of 2L, close to the wavelength of a pair of convections rolls. For a small amplitude of 0.5 microK, this perturbation gave a semiquantitative agreement with experimental observations. Results for various noise amplitudes are presented and discussed in relation to predictions by El Khouri and Carle`s.
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"abstract": "Numerical simulation studies in 2D with the addition of noise are reported\nfor the convection of a supercritical fluid,3He, in a Rayleigh-Be\u0027nard cell\nwhere the fluid parameters and cell height L are the same as in published\nlaboratory experiments. The noise addition is to accelerate the instability\nonset after starting the heat flow across the fluid, so as to bring simulations\ninto better agreement with experimental observations. Homogeneous temperature\nnoise and spatial lateral periodic temperature variations in the top plate were\nprogrammed into the simulations. A speed-up in the instability onset was\nobtained, which was most effective through the spatial temperature variations\nwith a period of 2L, close to the wavelength of a pair of convections rolls.\nFor a small amplitude of 0.5 microK, this perturbation gave a semiquantitative\nagreement with experimental observations. Results for various noise amplitudes\nare presented and discussed in relation to predictions by El Khouri and\nCarle`s.",
"arxiv_id": "physics/0411187",
"authors": [
"Akira Furukawa",
"Horst Meyer",
"Akira Onuki"
],
"categories": [
"physics.flu-dyn"
],
"doi": "10.1103/PhysRevE.71.067301",
"title": "Numerical simulations studies of the convective instability onset in a supercritical fluid",
"url": "https://arxiv.org/abs/physics/0411187"
},
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