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NUMERICAL INVESTIGATION OF FLOWREVERSALS IN A FLAT RAYLEIGH-BENARD CELL

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The present work deals with the reversal process of the large-scale circulation filling a flat square Rayleigh-Bénard cell of transverse aspect ratio 0.25 (depth by height). 3D spectral computations have been performed at Ra = 107 and P r = 5.5. Results present agreement with the experimental and 2D numerical observations [5] of a diagonal main roll coupled to two smaller rolls located in both remaining opposite corners. However additional patterns are identified which reveal a more complex reversal process than in a perfectly 2D configuration.

Author(s):

Anne Sergent    
LIMSI - UPMC
France

Bérengère Podvin    
LIMSI
France