Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.224503
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Funding
- EPSRC
- Royal Society
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Well-resolved direct numerical simulations of 2D Rayleigh-Benard convection in a porous medium are presented for Rayleigh numbers Ra <= 4 x 10(4) which reveal that, contrary to previous indications, the linear classical scaling for the Nusselt number, Nu similar to Ra, is attained asymptotically. The flow dynamics are analyzed, and the interior of the vigorously convecting system is shown to be increasingly well described as Ra -> infinity by a simple columnar heat-exchanger model with a single horizontal wave number k and a linear background temperature field. The numerical results are approximately fitted by k similar to Ra-0.4.
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