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Three-dimensional thermal cellular convection in rectangular boxes

Published online by Cambridge University Press:  21 April 2006

K. R. Kirchartz and
H. Oertel Jr
K. R. Kirchartz
Affiliation:
Institut für Strömungslehre und Strömungsmaschinen, Universität (TH) Karlsruhe, West Germany
H. Oertel Jr
Affiliation:
Institut für Theoretische Strömungsmechanik, DFVLR-AVA, Göttingen, West Germany
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Abstract

The extension of the classic Rayleigh–Bénard problem of a horizontal layer heated from below to the three-dimensional convection in rectangular boxes is dealt with in this paper both numerically and experimentally. Also discussed is the influence of shear flows in tilted boxes and the transition to time-dependent oscillatory convection. Three-dimensional numerical simulations allow the calculation of stationary solutions and the direct simulation of oscillatory instabilities. We limited ourselves to laminar and transcritical flows. For studying the particular characteristics of three-dimensional convection in horizontal containers, we carefully selected two container geometries with aspect ratios of 10:4:1 and 4:2:1. The onset of steady cellular convection in tilted boxes is calculated by an iterative application of a combined finite-difference method and a Galerkin method. The appearance of longitudinal and transverse convection rolls is determined by means of inter-ferometrical measuring techniques and is compared with the results of the linear stability theory. The spatial flow structure and the transition to oscillatory convection is calculated for selected examples in the range of supercritical Rayleigh numbers. Experimental investigations concerning the stability behaviour of the steady solutions with regard to time-dependent disturbances show a distinct influence of the Prandtl number and confirm the importance of nonlinear effects.

Information

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 192 , July 1988, pp. 249 - 286
Copyright
© 1988 Cambridge University Press

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