Magnetic field generation by convective flows in a plane layer: the dependence on the Prandtl numbers

摘要: Investigation of magnetic field generation by convective flows is carried out for three values kinematic Prandtl number: P = 0.3, 1 and 6.8. We consider Rayleigh–Benard convection in Boussinesq approximation assuming stress-free boundary conditions on horizontal boundaries periodicity with the same period x y directions. Convective attractors are modelled increasing Rayleigh numbers each value number. Linear non-linear dynamo action these studied m ≤ 100. Flows, which can act as dynamos, have been found all considered P, if number R large enough. The minimal R, occurs, increases P. minimum (over R) critical Pm regime admitted 0.3. Thus, our study indicates that smaller beneficial generation.