WIT Press

Effect Of A Constant And Uniform Magnetic Field On Rayleigh-Benard Instabilities In Cylindrical Cavities

Price

Free (open access)

Paper DOI

10.2495/AFM980151

Volume

18

Pages

10

Published

1998

Size

840 kb

Author(s)

R. Touihri, H. BenHadid & D. Henry

Abstract

The effect of a constant and uniform magnetic field on three dimen- sional steady flow is numerically simulated in cylindrical cavity of aspect ratio A — H/D (H is the height and D the diameter). The flow patterns at thresholds are generally identified with respect to their azimuthal variations in exp(im6}. Without magnetic field, ba- sic axisymmetric (m = 0) and asymmetric (m = 1 and m = 2) modes are obtained. For A=0.5, the axisymmetric flow becomes unstable at a secondary bifurcation point. The use of a vertical magnetic field keeps the same convective modes, but they are not equally stabi- lized. The horizontal magnetic field breaks some symmetries of the flow. Therefore, the convective modes are changed and t

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