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Penetrative convect...
Penetrative convection at high Rayleigh numbers
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- Toppaladoddi, Srikanth (författare)
- Yale Univ, New Haven, CT 06520 USA.;Univ Oxford, All Souls Coll, Oxford OX1 4AL, England.;Univ Oxford, Dept Phys, Oxford OX1 3PU, England.;Univ Oxford, Math Inst, Oxford OX2 6GG, England.
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- Wettlaufer, John S. (författare)
- KTH,Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Yale University, USA; University of Oxford, United Kingdom,Nordic Institute for Theoretical Physics NORDITA,Yale Univ, New Haven, CT 06520 USA.;Univ Oxford, Math Inst, Oxford OX2 6GG, England
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Yale Univ, New Haven, CT 06520 USA;Univ Oxford, All Souls Coll, Oxford OX1 4AL, England.;Univ Oxford, Dept Phys, Oxford OX1 3PU, England.;Univ Oxford, Math Inst, Oxford OX2 6GG, England. Nordiska institutet för teoretisk fysik (Nordita) (creator_code:org_t)
- American Physical Society, 2018
- 2018
- Engelska.
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Ingår i: Physical review fluids. - : American Physical Society. - 2469-990X. ; 3:4
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- We study penetrative convection of a fluid confined between two horizontal plates, the temperatures of which are such that a temperature of maximum density lies between them. The range of Rayleigh numbers studied is Ra = [10(6),10(8)] and the Prandtl numbers are Pr = 1 and 11.6. An evolution equation for the growth of the convecting region is obtained through an integral energy balance. We identify a new nondimensional parameter, Lambda, which is the ratio of temperature difference between the stable and unstable regions of the flow; larger values of Lambda denote increased stability of the upper stable layer. We study the effects of Lambda on the flow field using well-resolved lattice Boltzmann simulations and show that the characteristics of the flow depend sensitively upon it. For the range Lambda = [0.01,4], we find that for a fixed Ra the Nusselt number, Nu, increases with decreasing Lambda. We also investigate the effects of Lambda on the vertical variation of convective heat flux and the Brunt-Vaisala frequency. Our results clearly indicate that in the limit Lambda -> 0 the problem reduces to that of the classical Rayleigh-Benard convection.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Astrophysical fluid dynamics
- Convection and buoyancy-driven flows
- Geophysical fluid dynamics
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