Long time evolution of large-scale patterns in a rectangular Rayleigh-Bénard cell
Résumé
The time evolution of the network of quasi-stationary rolls is investigated for the case of a large aspect ratio rectangular Rayleigh-Bénard cell (A = 5) by using large eddy simulations. For Rayleigh numbers between 107 and 1010 sudden transitions without any external intervention have been observed in all studied cases between two mean flows which are stable on very long time period. During transition, a short reorientation of the rolls axis leads to a flow reversal and an increase in the size of the resulting rolls.
Domaines
Physique [physics]
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