Magnetic field generation by intermittent convection

Author(s)

Chertovskih, R. ^{[1, 2]} ; Rempel, E. L. ^{[3, 4, 5]} ; Chimanski, E. V. ^[3]

Affiliation

^[1] Univ Porto, Fac Engn, Res Ctr Syst & Technol, Rua Dr Roberto Frias, S-N, P-4200465 Oporto - Portugal

^[2] Samara Natl Res Univ, Moskovskoye Shosse 34, Samara 443086 - Russia

^[3] Aeronaut Inst Technol, Sao Jose Campos, BR-12228900 Sao Paulo - Brazil

^[4] Natl Inst Space Res, Sao Jose Campos, BR-12227010 Sao Paulo - Brazil

^[5] World Inst Space Environm Res, Sao Jose Campos, BR-12227010 Sao Paulo - Brazil

• Document type: Journal article
• Source: Physics Letters A; v. 381, n. 38, p. 3300-3306, OCT 10 2017.
• Web of Science Citations: 3

Abstract

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. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 13/26258-4 - Superdense matter in the universe
• Grantee: Manuel Máximo Bastos Malheiro de Oliveira
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/01242-8 - Generation of large-scale magnetic field by Rayleigh-Bénard convection
• Grantee: Roman Chertovskikh
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 16/07398-8 - Extension of the quantum formalism for direct multistep reactions
• Grantee: Emanuel Vicente Chimanski
• Support Opportunities: Scholarships in Brazil - Doctorate