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• W3037757922 abstract "The classical Rayleigh-B'enard convection (RBC) system is known to exhibit either subcritical or supercritical transition to convection in the presence or absence of rotation and/or magnetic field. However, the simultaneous exhibition of subcritical and supercritical branches of convection in plane layer RBC depending on the initial conditions, to the best of our knowledge, has not been reported so far. Here, we report the phenomenon of simultaneous occurrence of subcritical and supercritical branches of convection in overstable RBC of electrically conducting low Prandtl number fluids (liquid metals) in the presence of an external uniform horizontal magnetic field and rotation about the vertical axis. Extensive three-dimensional (3D) direct numerical simulations (DNS) and low-dimensional modeling of the system, performed in the ranges $750ensuremath{le}mathrm{Ta}ensuremath{le}3000$ and $0<Qensuremath{le}1000$ of the Taylor number ($mathrm{Ta}$, strength of the Coriolis force) and the Chandrasekhar number ($Q$, strength of the Lorenz force), respectively, establish the phenomenon convincingly. Detailed bifurcation analysis of a simple 3D model derived from the DNS data reveals that a supercritical Hopf bifurcation and a subcritical pitchfork bifurcation of the conduction state are responsible for this. The effect of Prandtl number on these transitions is also explored in detail." @default.
• W3037757922 created "2020-07-02" @default.
• W3037757922 creator A5017085188 @default.
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• W3037757922 date "2020-07-21" @default.
• W3037757922 modified "2023-09-23" @default.
• W3037757922 title "Transitions in overstable rotating magnetoconvection" @default.
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• W3037757922 doi "https://doi.org/10.1103/physreve.102.013107" @default.
• W3037757922 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32795050" @default.
• W3037757922 hasPublicationYear "2020" @default.
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