The effect of a constant and uniform magnetic field on three dijen-sional steady flow is numerically simulated in cylindrical cavity of aspect ratio A = H/D (H is hte hight and D the diameter). The flow pattens at thresholds are generally identified with respect to their azimuthal variations in exp(imtheta). Without magnetic field, basic axisymmetric (m=0) and asymmetric (m=1 and m=2) modes are obtained. For A=0.5, the axisymmetrix 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 stabilized. The horizontalmagnetic field breaks some symmetries of the flow. Therefore, the convective mdoes are changed and the secondary bifurcation disappears.
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机译：在纵横比a = H / d的圆柱形空腔中模拟了恒定和均匀磁场的效果，在宽高比a = h / d（h是HTE高位和D直径）的圆柱形腔中。通常相对于exp（imtheta）的方位角变化识别出阈值的流动浇口。没有磁场，获得基本轴对称（M = 0）和不对称（M = 1和M = 2）模式。对于A = 0.5，轴帧流在二次分叉点处变得不稳定。使用垂直磁场保持相同的对流模式，但它们不同等稳定。水平磁场破坏了流量的一些对称性。因此，对流MDOES改变，二次分叉消失。
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