Phys. Rev. E 66, 036307 (2002) [5 pages]Numerical insight into flow structure in ultraturbulent thermal convectionReceived 24 November 2001; published 19 September 2002 Very large eddy simulations of high-aspect-ratio unbounded Rayleigh-Bénard convection for Pr=0.71 over a 10-decade range of Rayleigh numbers (Ra=105–1015) reveal a consolidation and dramatic thinning of the wall boundary layer with an increase in the Ra number. The fingerlike plumes between planform structures become also thinner, more distant, but much more vigorous. The Ra exponent in the Nu∝Ran correlation follows n≈0.31 scaling, but n begins to increase gradually above Ra=1013. However, no trend towards “crossing” of the thermal and hydrodynamic boundary layers is observed. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.66.036307
DOI:
10.1103/PhysRevE.66.036307
PACS:
47.27.Eq, 47.27.Te, 44.25.+f
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