NDLI: RANS-Based VLES of Thermal and Magnetic Convection at Extreme Conditions

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hanjalic´, K. Kenjeresˇ, S.
Copyright Year	2003
Abstract	For thermal and magnetic convection at very high Rayleigh and Hartman numbers, which are inaccessible to the conventional large eddy simulation (LES), we propose a time-dependent Reynolds-average-Navier-Stokes (T-RANS) approach in which the large-scale deterministic motion is fully resolved by time and space solution, whereas the unresolved stochastic motion is modelled by a “subscale” model for which an one-point RANS closure is used. The resolved and modelled contribution to the turbulence moments are of the same order of magnitude and in near-wall regions the modelled heat transport becomes dominant, emphasizing the role of the subscale model. This VLES approach, with an algebraic stress/flux subscale model, verified earlier in comparison with direct numerical simulation (DNS) and experiments in classic Rayleigh-Be´nrad convection, is now expanded to simulate Rayleigh-Be´nard (R-B) convection at very high Ra numbers — at present up to O(1016) — and to magnetic convection in strong uniform magnetic fields. The simulations reproduce the convective cell structure and its reorganization caused by an increase in Ra number and effects of the magnetic field. The T-RANS simulations of classic R-B indicate expected thinning of both the thermal and hydraulic wall boundary layer with an increase in the Ra number and an increase in the exponent of the Nu ∝ Ran correlation in accord with recent experimental findings and Kraichnan asymptotic theory.
Sponsorship	Fluids Engineering Division
Starting Page	1961
Ending Page	1973
Page Count	13
File Format	PDF
ISBN	0791836975
DOI	10.1115/FEDSM2003-45344
e-ISBN	0791836738
Volume Number	Volume 2: Symposia, Parts A, B, and C
Conference Proceedings	ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
Language	English
Publisher Date	2003-07-06
Publisher Place	Honolulu, Hawaii, USA
Access Restriction	Subscribed
Subject Keyword	Heat Turbulence Algebra Large eddy simulation Simulation Computer simulation Reynolds-averaged navier–stokes equations Engineering simulation Magnetic fields Convection Boundary layers Stress
Content Type	Text
Resource Type	Article

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