Magnetic field generation by intermittent convection

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Chertovskih, R (Author) FEUP; Rempel, EL (Author) Other; Chimanski, EV (Author) Other

Journal

Title: Physics Letters A

Vol. 381

Pages: 3300-3306

ISSN: 0375-9601

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 9 Citations

Other information

Authenticus ID: P-00N-3XX

DOI: 10.1016/j.physleta.2017.08.025

Abstract (EN): Magnetic field generation in three-dimensional Rayleigh-Benard convection of an electrically conducting fluid is studied numerically by fixing the Prandtl number at P = 0.3 and varying the Rayleigh number (Ra) as a control parameter. A recently reported route to hyperchaos involving quasiperiodic regimes, crises and chaotic intermittent attractors is followed, and the critical magnetic Prandtl number (P-m(c)) for dynamo action is determined as a function of Ra. A mechanism for the onset of intermittency in the magnetic energy is described, the most beneficial convective regimes for dynamo action in this transition to weak turbulence are identified, and the impact of intermittency on the dependence of P-m(c) on Ra is discussed.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7