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Nonlinear dynamo action in a cylindrical container driven by precession

2011; IOP Publishing; Volume: 318; Issue: 7 Linguagem: Inglês

10.1088/1742-6596/318/7/072034

1742-6596

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

Geophysics and Gravity Measurements

Precession, which results simply from the composition of two rotations with distinct axes, is an efficient way to drive a 3D flow in a closed rigid container. Are such flows relevant to dynamo action in some astrophysical bodies? Positive answers are available for a spherical and a spheroidal containers, using parameters which are, however, not realistic. An experimental approach could be relevant to natural dynamos and seems within reach using a cylindrical container (cf. the experiment now planned at the DREsden Sodium facility for DYNamo and thermohydraulic studies in Germany (DRESDYN), F. Stefani, personal communication, 2011). Using a nonlinear magnetohydrodynamics (MHD) code (SFEMaNS), we numerically demonstrate that precession is able to drive a cylindrical dynamo.