Three-dimensional Rayleigh–Bénard instability in a supercritical fluidInstabilité tridimensionnelle de Rayleigh–Bénard dans un fluide supercritique |
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Authors: | Gilbert Accary Isabelle Raspo Patrick Bontoux Bernard Zappoli |
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Affiliation: | 1. MSNM-GP UMR 6181 CNRS, Les Universités d''Aix-Marseille, IMT – La Jetée, Technopôle de Château Gombert, 38, rue Frédéric Joliot Curie, 13451 Marseille cedex 20, France;2. CNES, 18, avenue Edouard Belin, 31401 Toulouse cedex 4, France |
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Abstract: | This paper describes the unsteady convective flow of a supercritical fluid in the Rayleigh–Bénard configuration. Two-dimensional earlier studies reported fast temperature equilibrium due to the piston effect and the development of a convective instability when the local Rayleigh number exceeds a critical value. In the present work, a high order 3D finite volume method has been developed and optimized, and to our knowledge, we show for the first time a three-dimensional convective instability in a supercritical fluid. Inspecting the time-evolution of temperature field patterns, we exhibit corner effects and a three-dimensional behavior of the flow. To cite this article: G. Accary et al., C. R. Mecanique 332 (2004). |
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Keywords: | Fluid mechanics Supercritical fluid Rayleigh–Bénard configuration 3D convective instability Piston effect Mécanique des fluides Fluide supercritique Configuration de Rayleigh–Bénard Instabilité convective 3D Effet piston |
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