D114 磁気回転不安定性の検証実験に関する数値シミュレーション : テーラー=クエット系における循環流

概要

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Aiming the first laboratory demonstration of magnetorotational instability (MRI), a liquid metal MHD experiment is undertaken at Princeton Plasma Physics Laboratory (PPPL). In order to produce a flow stable to hydronamic modes but unstable to MRI, a prototype water experiment in the same geometry has been performed. The initially proposed experimental setup consists of two concentric sbort cylinders rotating at constant angular velocities. However, preliminary data indicate that the toroidal flow profile in this cylindrical, or rather a disk-like, vessel is strongly affected by the vessel's horizontal boundaries (the lid and the bottom). Since the profile control of the toroidal flow is essential for the MRI experiment, we performed 2-D numerical simulations of this Navier-Stokes system to understand the flow structure and the boundary effect in detail. The simulation model, results, and comparison with experimental data will be presented in this talk. A poloidal circulation flow is driven at the boundaries by an Ekman-like effect. We found, in our numerical simulations, that a jet structure is formed as a part of the poloidal circulation. This poloidal circulation significantly modifies the toroidal flow from its preferred profile for the MRI experiment. A remedy to remove or minimize the effects of the poloidal circulation will be also presented.
日本流体力学会の論文
2002-07-23