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Optimal heat transport solutions for Rayleigh–Bénard convection

Published online by Cambridge University Press:  06 November 2015

David Sondak ,
Leslie M. Smith  and
Fabian Waleffe
David Sondak*
Affiliation:
Department of Mathematics, University of Wisconsin-Madison, Madison, WI 53706, USA
Leslie M. Smith
Affiliation:
Department of Mathematics, University of Wisconsin-Madison, Madison, WI 53706, USA Department of Engineering Physics, University of Wisconsin-Madison, Madison, WI 53706, USA
Fabian Waleffe
Affiliation:
Department of Mathematics, University of Wisconsin-Madison, Madison, WI 53706, USA Department of Engineering Physics, University of Wisconsin-Madison, Madison, WI 53706, USA
*
†Email address for correspondence: [email protected]
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Abstract

Steady flows that optimize heat transport are obtained for two-dimensional Rayleigh–Bénard convection with no-slip horizontal walls for a variety of Prandtl numbers $\mathit{Pr}$ and Rayleigh number up to $\mathit{Ra}\sim 10^{9}$. Power-law scalings of $\mathit{Nu}\sim \mathit{Ra}^{{\it\gamma}}$ are observed with ${\it\gamma}\approx 0.31$, where the Nusselt number $\mathit{Nu}$ is a non-dimensional measure of the vertical heat transport. Any dependence of the scaling exponent on $\mathit{Pr}$ is found to be extremely weak. On the other hand, the presence of two local maxima of $\mathit{Nu}$ with different horizontal wavenumbers at the same $\mathit{Ra}$ leads to the emergence of two different flow structures as candidates for optimizing the heat transport. For $\mathit{Pr}\lesssim 7$, optimal transport is achieved at the smaller maximal wavenumber. In these fluids, the optimal structure is a plume of warm rising fluid, which spawns left/right horizontal arms near the top of the channel, leading to downdraughts adjacent to the central updraught. For $\mathit{Pr}>7$ at high enough $\mathit{Ra}$, the optimal structure is a single updraught lacking significant horizontal structure, and characterized by the larger maximal wavenumber.

JFM classification

Mathematical Foundations: Computational methods Turbulent Flows: Turbulent convection
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Journal of Fluid Mechanics , Volume 784 , 10 December 2015 , pp. 565 - 595
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© 2015 Cambridge University Press 

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