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THMT-15. Proceedings of the Eighth International Symposium On Turbulence Heat and Mass Transfer
September, 15-18, 2015, Sarajevo, Bosnia and Herzegovina

DOI: 10.1615/ICHMT.2015.THMT-15


ISBN Print: 978-1-56700-427-4

ISBN CD: 978-1-56700-428-8

Numerical Analysis of Multiplicity and Transition Phenomena in Natural Convection

pages 387-390
DOI: 10.1615/ICHMT.2015.THMT-15.770
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SINOPSIS

A parametric investigation of the transition from steady to oscillatory state, and multiplicity phenomena in natural convection are studied for 2-D cavity. In this study the effects of different parameters such as Prandtl number (Pr), Rayleigh number (Ra), and aspect ratio (AR) are numerically analyzed. The complex phenomenon of onset of instability in a specific range of Ra numbers is examined, and multiple steady states are observed. It is found that, even at low Ra numbers, the flow undergoes a series of turning-point bifurcations which increase the rate of convective flow. The dependence of the critical Ra number on the AR and the Pr number is shown in stability diagrams.

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