Prime modes of fluid circulation in large-aspect-ratio turbulent Rayleigh-Bénard convection | Zendy

Jos Verdoold | Zendy; M.J. Tummers | Zendy; K. Hanjalić | Zendy

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Prime modes of fluid circulation in large-aspect-ratio turbulent Rayleigh-Bénard convection

Author(s) -

Jos Verdoold,

M.J. Tummers,

K. Hanjalić

Publication year - 2009

Publication title -

physical review e

Language(s) - English

Resource type - Journals

eISSN - 1550-2376

pISSN - 1539-3755

DOI - 10.1103/physreve.80.037301

Subject(s) - aspect ratio (aeronautics) , turbulence , particle image velocimetry , scaling , rayleigh–bénard convection , convection , physics , mechanics , rayleigh scattering , circulation (fluid dynamics) , omega , rayleigh number , optics , mathematics , geometry , natural convection , optoelectronics , quantum mechanics

Based on a detailed experimental investigation in an aspect-ratio-4 rectangular cell in the range 3.7×107?Ra?3.7×109, we present evidence of possible scenarios of the long-term dynamics of large-scale circulations (LSC) in bounded large-aspect-ratio turbulent Rayleigh-Bénard convection. Karhunen-Loève analysis of instantaneous velocity fields from long-time particle image velocimetry measurements suggests two different states, but both appear to be produced by a single large-scale flow structure. The measurements provide a three-dimensional picture of LSC in the ?=4 cell. A modified scaling relation between the LSC peak frequency ?p and Ra is proposed.Multi-Scale PhysicsApplied Science

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