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Nonlinear dynamo action in a precessing cylindrical container

2011; American Physical Society; Volume: 84; Issue: 1 Linguagem: Inglês

10.1103/physreve.84.016317

1550-2376

Caroline Nore, J. Léorat, Jean‐Luc Guermond, Francky Luddens,

Geophysics and Gravity Measurements

It is numerically demonstrated by means of a magnetohydrodynamics code that precession can trigger the dynamo effect in a cylindrical container. When the Reynolds number, based on the radius of the cylinder and its angular velocity, increases, the flow, which is initially centrosymmetric, loses its stability and bifurcates to a quasiperiodic motion. This unsteady and asymmetric flow is shown to be capable of sustaining dynamo action in the linear and nonlinear regimes. The magnetic field thus generated is unsteady and quadrupolar. These numerical evidences of dynamo action in a precessing cylindrical container may be useful for an experiment now planned at the Dresden sodium facility for dynamo and thermohydraulic studies in Germany.