On-off intermittency and spatiotemporal chaos in three-dimensional Rayleigh-Benard convection

Autor(es)

Chimanski, Emanuel V. ^[1] ; Rempel, Erico L. ^{[1, 2, 3]} ; Chertovskih, Roman ^[1]

Afiliação do(s) autor(es)

^[1] Aeronaut Inst Technol IEFM ITA, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[2] Natl Inst Space Res DGE INPE, POB 515, BR-12227010 Sao Jose Dos Campos, SP - Brazil

^[3] WISER, POB 515, BR-12227010 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Advances in Space Research; v. 57, n. 6, p. 1440-1447, MAR 15 2016.
• Citações Web of Science: 0

Resumo

Convective instabilities of viscous conducting fluids play an important role in many physical phenomena in planets and stars. Astrophysical magnetic fields are usually explained in a framework of the dynamo theory, describing transformation of the kinetic energy of a flow into magnetic energy. Therefore, an analysis of purely convective states and their bifurcations, as a control parameter is changed, provides a detailed framework for the subsequent study of magnetic field generation by these states. In this paper, three-dimensional Rayleigh-Benard convection in the absence of magnetic field is investigated numerically for various values of the Rayleigh number and a fixed Prandtl number (corresponding to its value for convection in the Earth's outer core). On increasing the Rayleigh number, we identified periodic, quasiperiodic, chaotic and hyperchaotic attractors of the convective system and their bifurcations, thereby describing a route to spatiotemporal chaos in the convective system. The occurrence of on off intermittency in the energy time series is discussed. (C) 2015 COSPAR. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 13/22314-7 - Campos magnéticos e dínamos em plasmas espaciais e astrofísicos II
• Beneficiário: Erico Luiz Rempel
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/01242-8 - Geração de campos magnéticos de grandes escalas por convecção de Rayleigh-Bénard
• Beneficiário: Roman Chertovskikh
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado