Overstable rotating convection in the presence of a vertical magnetic field

Recently, Banerjee et al. [Phys. Rev. E 102, 013107 (2020)] investigated overstable rotating convection in the presence of an external horizontal magnetic field and reported a rich bifurcation structure near onset. However, onset vertical has not been explored yet. We address issue here by performing three dimensional direct numerical simulations low-dimensional modeling system using Rayleigh–Bénard model. The control parameters, namely, Taylor number (Ta), Chandrasekhar (Q), Prandtl (Pr) are varied ranges 750 ? Ta 10 6 , 0 < Q 3, Pr 0.5. Our investigation reveals two qualitatively different scenarios including bistability (coexistence subcritical supercritical convections). Analysis model shows that Hopf is responsible for pitchfork It also observed appearance at strong dependence on all parameters: Ta, Q, Pr. scenario found to disappear as increased fixed Q. most striking findings increment opposes convection, whereas favors it. This sharp contrast with earlier results magnetoconvection.