Regime transitions in thermally driven high-Rayleigh number vertical convection
نویسندگان
چکیده
Abstract
منابع مشابه
Ultimate regime of high Rayleigh number convection in a porous medium.
Well-resolved direct numerical simulations of 2D Rayleigh-Bénard convection in a porous medium are presented for Rayleigh numbers Ra≤4×10(4) which reveal that, contrary to previous indications, the linear classical scaling for the Nusselt number, Nu~Ra, is attained asymptotically. The flow dynamics are analyzed, and the interior of the vigorously convecting system is shown to be increasingly we...
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High-resolution numerical simulations of statistically steady convection in a threedimensional porous medium are presented for Rayleigh numbers Ra 6 2 × 104. Measurements of the Nusselt number Nu in the range 1750 6 Ra 6 2× 104 are well fitted by a relationship of the form Nu= α3Ra+ β3, for α3= 9.6× 10−3 and β3= 4.6. This fit indicates that the classical linear scaling Nu∼ Ra is attained, and t...
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The geometrically different plan forms of near wall plume structure in turbulent natural convection, visualised by driving the convection using concentration differences across a membrane, are shown to have a common multifractal spectrum of singularities for Rayleigh numbers in the range 10 − 10 at Schmidt number of 602. The scaling is seen for a length scale range of 2 and is independent of th...
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A brief review is given of recent laboratory investigations of high Ra convection and their relation to other turbulent flows. For a passive scalar we summarize an emerging body of theory for the one point distribution function and inertial range correlation functions which display non-Kolmogorov exponents. Low R a number convection has long been the system of choice for investigating the onset...
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2021
ISSN: ['0022-1120', '1469-7645']
DOI: https://doi.org/10.1017/jfm.2021.262