科研之友
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摘要
A simple model of precessionally-forced flow has been proposed and studied by Mason and Kerswell (Mason, R.M. and Kerswell, R.R., Chaotic dynamics in a strained rotating flow: a precessing plane fluid layer. Geophys. Astrophys. Fluid Dynam., 491, 2002, 71-106). The fluid is viscous and incompressible and occupies a plane layer that spins about its normal that itself precesses about an axis fixed in space. The present article confirms the linear stability results of Mason and Kerswell and investigates in greater detail the complicated bifurcation that arises at the onset of two-dimensional instability. Three-dimensional modes are studied and it is shown that, if the fluid is sufficiently electrically conducting, the motions can, for sufficiently strong precessional forcing, maintain a magnetic field by dynamo action. The Lorentz force is found to reduce the vigor of the motions but to modify them in a way that assists magnetic field generation.
- 出版日期2008
