Structure of the Wake of a Magnetic Obstacle

Details Structure of the Wake of a Magnetic Obstacle Structure of the Wake of a Magnetic Obstacle

2006-12-12

arxiv.org/abs/physics/0612103v3

Phys. Rev. Lett. 98, 144504 (2007)

Physics

Fluid Dynamics

4 pages, 5 figures, corrected two typos, accepted for PRL

Scientific paper

10.1103/PhysRevLett.98.144504

We use a combination of numerical simulations and experiments to elucidate the structure of the flow of an electrically conducting fluid past a localized magnetic field, called magnetic obstacle. We demonstrate that the stationary flow pattern is considerably more complex than in the wake behind an ordinary body. The steady flow is shown to undergo two bifurcations (rather than one) and to involve up to six (rather than just two) vortices. We find that the first bifurcation leads to the formation of a pair of vortices within the region of magnetic field that we call inner magnetic vortices, whereas a second bifurcation gives rise to a pair of attached vortices that are linked to the inner vortices by connecting vortices.

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