Experimental study of rough spherical Couette flows: Increasing helicity toward a dynamo state

Rojas, R.; Перевалов, А. А.; Zürner, Till; Lathrop, Daniel P.

doi:10.1103/physrevfluids.6.033801

Cited by 4 publications

(1 citation statement)

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“…Indeed, it was just in the last couple of decades that both laboratory experiments and numerical simulations were able to attain dynamo regimes which exhibit the kind of features found in celestial magnetic fields, such as a high degree of symmetry, polarity inversions, or periodic modulations [15][16][17]. In fact, the task of experimentally obtaining a self-sustaining dynamo regime from flow conditions which more closely resemble those found in celestial bodies is still being actively pursued [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effect of electromagnetic boundary conditions on the onset of small-scale dynamos driven by convection

Fontana¹,

Mininni²,

Dmitruk³

2022

Preprint

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We present a high-order numerical study of the dependence of the dynamo onset on different electromagnetic boundary conditions, in convecting Boussinesq flows forced by a temperature gradient. Perfectly conducting boundaries, vacuum, and mixed electromagnetic boundary conditions are considered, using a method that treats fields and boundary conditions with close to spectral accuracy. Having one or two conducting boundaries greatly facilitates dynamo action. For the mixed case it is shown that the critical magnetic Reynolds number becomes independent of the Rayleigh number, Ra, for sufficiently large Ra.

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