Ecoulements induits par la force gravifique dans une cavité cylindrique en rotation

Resume Une methode numerique du type Tau-Chebyshev est utilisee pour decrire le mouvement d'un fluide de Boussinesq en rotation, soumis a un gradient thermique radial. L'analyse des regimes d'ecoulement axisymetriques est developpee pour des cavites annulaires, lorsque les parametres physiques varient: 0 ≤ Re ≤ 2500; Ra = 10 2 , ± 10 4 , 10 5 ; 0 ≤ Fr ≤ 25. La transition entre les regimes de convection thermique et ceux domines par la rotation resulte de la competition entre les differentes forces : gravifique, centrifuge et de Coriolis. La validite des solutions asymptotiques proposees par Hunter (1966) lorsque Fr ⪡ 1 et Re ⪢ 1, est discutee lorsque Re varie.

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