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On the stability of rotating MHD flows

机译:旋转MHD流动的稳定性

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摘要

We present a numberical study of the flow induced by a rotating magnetic field on a liquid metal which fills a cylindrical container. Using a low frequency approximation and assuming axisymmetry, a finite difference technique is employed for the calculation of the flow field. Two different cases are considered in order to show that using a rotating magnetic field requires a detailed knowledge of its interaction with the flow. In the first situation, which is isothermal, it is shown that increasing the field intensity leads to the occurrence of Taylor-Couette type centrifugal instabilities depending upon the aspect ratio of the cavity. In the second case, which includes a heat transfer problem, it is shown that applying a very moderate rotating field to an initially unstable thermally driven convection is able to restore the flow stability.
机译:我们介绍了通过填充圆柱形容器的液态金属上的旋转磁场引起的流动的数字研究。使用低频近似和假设轴对称,采用有限差分技术来计算流场。考虑两种不同的情况,以表明使用旋转磁场需要详细了解其与流程的相互作用。在一种等温的第一局面中,示出了根据腔的纵横比,增加现场强度导致泰勒 - 汤型离心不置于的发生。在包括传热问题的第二种情况下,示出了将非常温和的旋转场应用于最初不稳定的热驱动的对流,能够恢复流动稳定性。

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